Generated by All in One SEO v5.0.1.1, this is an llms.txt file, used by LLMs to index the site. # DethWench Professional Services Let DethWench do your data... ## Sitemaps - [XML Sitemap](https://dethwench.com/sitemap.xml): Contains all public & indexable URLs for this website. ## Posts - [Blog](https://dethwench.com/blog/) - [Tips and Tricks for Data Close-out](https://dethwench.com/tips-and-tricks-for-data-close-out/) - [Four Levels of Intervention for Public Health: How to Apply This Framework](https://dethwench.com/four-levels-of-public-health-intervention-applied-examples/) - Four levels of intervention is a framework we use in public health to think about how to attack a problem. I explain it and give a few examples of application in my blog post (along with a video). - [“Bad Blood” Shows how Theranos was an Abject Failure in Data Stewardship: Part 3 of 5](https://dethwench.com/theranos-was-an-abject-failure-in-data-stewardship/) - The book "Bad Blood" describes the fall of startup unicorn Theranos, but also provides insight into the company's abject failure at data stewardship, which I talk about in this blog post. - [Review of Boston University MPH Online Learning Modules for Teaching Graduate Level Public Health Online](https://dethwench.com/review-boston-university-mph-online-learning-modules/) - If you are learning epidemiology or refreshing your memory of your formal study of it, you always want to have credible scientific definitions at hand of terms such as "measures of association". Read my blog post for quick links to Boston University's online educational module! - [Study Design Courses: Online Learning about Research Methods](https://dethwench.com/learn-research-design-online/) - Study design courses that you can access online will hand you a framework for research design, so you can develop useful analyses that guide you toward actionable goals. - [Biostatistics for Dummies: The Thinking Data Scientist’s Quintessential Professional Reference](https://dethwench.com/biostatistics-for-dummies-book-updated-2024/) - “Biostatistics for Dummies” is the thinking data scientist’s essential reference. Check out the updated 2024 version, which adds epidemiologic inference topics and modeling advice! - [Data Curation Course: Learn Data Curation Online from LinkedIn Learning!](https://dethwench.com/data-curation-course/) - Curation files are especially helpful for communicating about data on teams. Learn more about what you'll learn when you take my online LinkedIn Learning data curation course! - [Announcing the Publication of my New SAS Book on Data Warehousing](https://dethwench.com/sas-book-on-data-warehousing/) - SAS is known for big data and data warehousing, but how do you actually design and build a SAS data warehouse or data lake? What datasets do you include? How do you transform them? How do you serve warehouse users? How do you manage your developers? This book has your answers! - [Confidence Intervals are for Estimating a Range for the True Population-level Measure](https://dethwench.com/try-our-example-of-how-to-calculate-confidence-intervals/) - Confidence intervals (CIs) help you get a solid estimate for the true population measure. Read my blog and try my CI calculator! - [Ch 10 Confidence Intervals](https://dethwench.com/ch-10-confidence-intervals/) - [Continuous Variable? You Can Categorize it!](https://dethwench.com/classify-your-continuous-variables-for-an-easy-descriptive-analysis/) - Continuous variable categorized can open up a world of possibilities for analysis. Read about it on my blog! - [Descriptive Analysis of Black Friday Death Count Database: Creative Classification](https://dethwench.com/descriptive-analysis-for-data-science-portfolio-projects/) - Descriptive analysis of Black Friday Death Count Database provides an example of how creative classification can make a quick and easy data science portfolio project! - [Delete if the Row Meets Criteria? Do it in SAS!](https://dethwench.com/use-if-statements-to-delete-rows-in-sas/) - Delete if rows meet a certain criteria is a common approach to paring down a dataset. Read my blog for an example in SAS! - [Survey Documentation: Good Luck Analyzing Survey Data Without it!](https://dethwench.com/make-analytic-documentation-for-your-online-survey/) - [Doing Surveys? Try my R Likert Plot Data Hack!](https://dethwench.com/likert-plot-data-hack/) - I love the Likert package in R, and use it often to visualize data. The problem is that sometimes, I have sparse data, and this can cause problems with the package. This blog post shows you a workaround, and also, a way to format the final plot that I think looks really great! - [Create Documentation for Online Surveys](https://dethwench.com/create-documentation-for-online-surveys/) - [Chi-square Test: Insight from Using Microsoft Excel](https://dethwench.com/learn-how-to-do-a-chi-square-test-in-excel/) - Chi-square test is hard to grasp – but doing it in Microsoft Excel can give you special insight. Read about it on my blog! - [Chi-square in Excel](https://dethwench.com/chi-square-in-excel/) - [Identify Elements of Research in Scientific Literature](https://dethwench.com/how-to-identify-elements-of-research-in-peer-reviewed-articles/) - Identify elements in research reports, and you’ll be able to understand them much more easily. My blog post shows you how! - [Identify Elements Challenge](https://dethwench.com/identify-elements-challenge/) - [Design the Most Useful Time Periods for Your Conversions](https://dethwench.com/how-to-choose-time-periods-for-conversion-rates-time-series-analysis/) - Time periods are important when creating a time series visualization that actually speaks to you! Get advice on my blog. - [Time Periods for Conversions](https://dethwench.com/time-periods-for-conversions/) - [Time Series Plots in R Using ggplot2 Are Ultimately Customizable](https://dethwench.com/time-series-plots-in-r/) - Time series plots in R are totally customizable using the ggplot2 package, and can come out with a look that is clean and sharp. However, you usually end up fighting with formatting the x-axis and other options, and I explain in my blog post. - [DPS Update: I’m back in business!](https://dethwench.com/good-news-i-am-back-in-business-dps-update/) - DPS Update: I’m doing better and working again! Check out my updated LinkedIn Learning courses and books for sale! - [DPS Temporary Closure: Sad News! I am Disabled!](https://dethwench.com/dethwench-professional-services-monika-wahi-temporary-closure/) - DPS temporary closure as of December 31, 2024 because I have become too disabled to work. Learn the details in my blog post. - [Apply Weights? It’s Easy in R with the Survey Package!](https://dethwench.com/apply-population-based-weights-in-r/) - Apply weights to get weighted proportions and counts! Read my blog post to learn how to use the survey package in R. - [Make Categorical Variable Out of Continuous Variable](https://dethwench.com/convert-a-continuous-variable-to-categorical-in-r/) - Make categorical variables by cutting up continuous ones. But where to put the boundaries? Get advice on my blog! - [Remove Rows in R with the Subset Command](https://dethwench.com/use-the-subset-command-to-remove-rows-in-r-gui/) - Remove rows by criteria is a common ETL operation – and my blog post shows you how to do it using the subset command. - [NHANES Data: Pitfalls, Pranks, Possibilities, and Practical Advice](https://dethwench.com/nhanes-datasets-for-use-in-data-analysis/) - NHANES data piqued your interest? It’s not all sunshine and roses. Read my blog post to see the pitfalls of NHANES data, and get practical advice about using them in a project. - [Measuring Integrativeness in Arabic Learners at Saudi Arabia’s Language Institutes](https://dethwench.com/how-to-measure-integrativeness-in-l2-learning/) - Measuring integrativeness is helpful in second-language learning, but how do you do it? This blog post highlights an article that provides an example. - [“Bad Blood” Reveals Theranos was Guilty of Bad Business and Bad Data Science: Part 1 of 5](https://dethwench.com/learn-to-prevent-research-misconduct/) - This is my first blog post in a series of five where I talk about data-related misconduct outlined in the book "Bad Blood", and provide guidance on how to prevent it. - [“Bad Blood” Highlights the Issues with No Administrative Barrier between Research and Clinical Data: Part 5 of 5](https://dethwench.com/no-administrative-barrier-between-research-and-clinical-data/) - Read my last post in a series on data-related misconduct at startup Theranos outlined in the book, "Bad Blood", where I discuss their lack of administrative barrier between research and clinical data. - [Researching Data Science Companies: How to Evaluate Your Future Employer](https://dethwench.com/researching-data-science-companies-where-you-want-to-work/) - Researching data science companies who might be your future employers, but you don’t know where to start? Read my blog post to learn my simple approach. - [Healthcare Data Science Newbie Do-it-Yourself Starter Kit](https://dethwench.com/healthcare-data-science-newbie-toolkit/) - Monika posts her “data science newbie do-it-yourself starter kit”, with links to cheap or free learning resources for the data science newbie who wants to get started in healthcare analytics. - [Quality Improvement in Healthcare: What is the PDSA Model, and How Well Does it Work for QA/QI? Part 1 of 5](https://dethwench.com/quality-improvement-in-healthcare/) - Wondering what the Plan-Do-Study-Act (PDSA) Model is, and if you should adopt it for quality improvement in healthcare? Read my series of blog posts on the subject for my personal experience and recommendations - [Does the PDSA Model Work? Part 3 of 5](https://dethwench.com/does-the-pdsa-model-work/) - The Plan-Do-Study-Act model is promoted for quality assurance/quality improvement in healthcare. But does it have any peer-reviewed evidence base behind it? I examine that in this blog post. - [The Stages of the PDSA Model: What do they Really Mean? Part 2 of 5](https://dethwench.com/what-stages-of-pdsa-model-mean/) - What are the stages of the PDSA model, and how do they relate to the functions of a QA/QI department in healthcare? The answers are not straightforward. I examine these issues in this blog post. - [CDC Wonder for Studying Vaccine Adverse Events: The Shameful State of US Open Government Data](https://dethwench.com/cdc-wonder-online-query-tool-for-vaccine-adverse-events/) - CDC Wonder is an online query portal that serves as a gateway to many government datasets. Although antiquated, it still works for extracting data, and my blog post shows you how. - [Alternative to the PDSA Model for QA/QI in Healthcare? Old-fashioned Epidemiology and Biostatistics! Part 4 of 5](https://dethwench.com/alternative-to-pdsa-model-quality-healthcare-part-4-of-5/) - Want an alternative to the Plan-Do-Study-Act (PDSA) model for quality assurance/quality improvement (QA/QI) in healthcare? I recommend approaching QA/QI a different way, by thinking about the various functions of the QA/QI department. - [Reducing Query Cost (and Making Better Use of Your Time)](https://dethwench.com/learn-to-calculate-the-cost-of-queries/) - Reducing query cost is especially important in SAS – but do you know how to do it, or what it even means? Read my blog post to learn why this is important in health data analytics. - [AI Careers: Riding the Bubble](https://dethwench.com/ai-careers-for-data-scientists-how-to-prepare-for-the-future/) - AI careers are not easy to navigate. Read my blog post for foolproof advice for those interested in building a career in AI. - [Curated Datasets: Great for Data Science Portfolio Projects!](https://dethwench.com/curated-datasets-for-data-science-portfolio-projects/) - Curated datasets are useful to know about if you want to do a data science portfolio project on your own. I made this blog post for our group mentoring program. Check out the ones I am promoting on my blog! - [Querying the GHDx Database: Demonstration and Review of Application](https://dethwench.com/querying-the-ghdx-database-demonstration/) - Querying the GHDx database is challenging because of its difficult user interface, but mastering it will allow you to access country-level health data for comparisons! See my demonstration! - [What is Open Access Publishing in Scientific Journals and Why Should I Pay for it?](https://dethwench.com/open-access-science-publishing/) - If you believe in open source software, then you probably also agree with open source publishing. Why is it so expensive compared to open source software? My blog post has the answers. - [US Public Health Alphabet Soup Explained: What is the FDA?](https://dethwench.com/public-health-what-is-the-fda/) - Can you name categories other than “food” and “drugs” that are regulated by the FDA in the US? Read this blog post to learn what they are, and what the FDA does in the US. - [How To Data Science Lecture Series](https://dethwench.com/how-to-data-science-lecture-series/) - [Fan Page for CJ Hutchings](https://dethwench.com/cjhutchings/) - Visit CJ Hutching's fan page for links to all his amazing paintings, books, and music! - [Testimonials for Monika Wahi's Linked In Data Science Courses](https://dethwench.com/testimonials-for-monika-wahi-data-science-linkedin-courses/) - Testimonials for Monika Wahi's data science courses on LinkedIn Learning are posted here. Read what learners are saying to help you decide if you want to take the courses! - [SAS-R Integration Example: Transform in R, Analyze in SAS!](https://dethwench.com/sas-r-integration-example-transform-in-r-analyze-in-sas/) - Looking for a SAS-R integration example that uses the best of both worlds? I show you a use-case where I was in a hurry, and did transformation in R with the analysis in SAS! - [FAERS Data: Getting Creative with an Adverse Event Surveillance Dashboard](https://dethwench.com/faers-data-for-portfolio-projects/) - FAERS data are like any post-market surveillance pharmacy data – notoriously messy. But if you apply strong study design skills and a scientific approach, you can use the FAERS online dashboard to obtain a dataset and develop an enlightening portfolio project. I show you how in my blog post! - [Classification Crosswalks: Strategies in Data Transformation](https://dethwench.com/classification-crosswalks-in-data-science/) - Classification crosswalks are easy to make, and can help you reduce cardinality in categorical variables, making for insightful data science portfolio projects with only descriptive statistics. Read my blog post for guidance! - [ETL Pipeline Documentation: Here are my Tips and Tricks!](https://dethwench.com/etl-pipeline-documentation-best-practices/) - ETL pipeline documentation is great for team communication as well as data stewardship! Read my blog post to learn my tips and tricks. - [R, SAS and More Lecture Series](https://dethwench.com/r-sas-and-more-lecture-series/) - [R Tricks for SAS Users](https://dethwench.com/r-tricks-for-sas-users/) - [Case Studies in SAS Integration](https://dethwench.com/case-studies-in-sas-integration/) - [US Public Health Alphabet Soup Explained: What is the DHHS?](https://dethwench.com/public-health-what-is-the-dhhs/) - My answer to, “What is the DHHS?” is, “A failed department”, but it is important to examined exactly what they have failed at, and how. - [Joins in Base R: Alternative to SQL-like dplyr](https://dethwench.com/how-to-join-using-merge-in-base-r/) - Joins in base R must be executed properly or you will lose data. Read my tutorial on how to correctly execute left joins in base R. - [Portfolio Projects with Pizzazz Lecture Series](https://dethwench.com/portfolio-projects-with-pizzazz-lecture-series/) - [GPower Case Example Shows How to Calculate and Document Sample Size](https://dethwench.com/gpower-case-example-shows-how-to-calculate-sample-size/) - GPower case example shows a use-case where we needed to select an outcome measure for our study, then do a power calculation for sample size required under different outcome effect size scenarios. My blog post shows what I did, and how I documented/curated the results. - [Dataset Source Documentation: Necessary for Data Science Projects with Multiple Data Sources](https://dethwench.com/keep-dataset-source-documentation-to-make-science-replicable/) - Dataset source documentation is good to keep when you are doing an analysis with data from multiple datasets. Read my blog to learn how easy it is to throw together some quick dataset source documentation in PowerPoint so that you don’t forget what you did. - [Shapes and Images in Dataviz: Making Choices for Optimal Communication](https://dethwench.com/how-to-use-shapes-and-images-in-data-visualizations/) - Shapes and images in dataviz, if chosen wisely, can greatly enhance the communicative value of the visualization. Read my blog post for tips in selecting shapes for data visualizations! - [Text and Arrows in Dataviz Can Greatly Improve Understanding](https://dethwench.com/how-to-configure-text-and-arrows-for-dataviz-in-powerpoint/) - Text and arrows in dataviz, if used wisely, can help your audience understand something very abstract, like a data pipeline. Read my blog post for tips in choosing images for your data visualizations! - [Defaults in PowerPoint: Setting Them Up for Data Visualizations](https://dethwench.com/how-to-set-defaults-in-powerpoint-for-dataviz/) - Defaults in PowerPoint are set up for slides – not data visualizations. Read my blog post for tips on reconfiguring PowerPoint to make it easy for dataviz! - [Color in Visualizations: Using it to its Full Communicative Advantage](https://dethwench.com/how-to-use-color-in-data-visualizations/) - Color in visualizations of data curation and other data science documentation can be used to enhance communication – I show you how! - [Portfolio Project Examples for Independent Data Science Projects](https://dethwench.com/portfolio-project-examples-for-data-science/) - Portfolio project examples are sometimes needed for newbies in data science who are looking to complete independent projects. This blog post provides some great examples of independent projects you can do with datasets available online! - [R for Logistic Regression: Example from Epidemiology and Biostatistics](https://dethwench.com/r-for-logistic-regression-in-health-data-analytics/) - R for logistic regression in health data analytics is a reasonable choice, if you know what packages to use. You don’t have to use SAS! My blog post provides you example R code and a tutorial! - [Table Editing in R is Easy! Here Are a Few Tricks…](https://dethwench.com/table-editing-in-r-can-be-done-easily/) - Table editing in R is easier than in SAS, because you can refer to columns, rows, and individual cells in the same way you do in MS Excel. Read my blog post for example R table editing code. - [Paid Mentoring for Data Science: Is it Worth the Cost?](https://dethwench.com/paid-mentoring-for-data-science-can-help-with-application/) - Paid mentoring for data science can be worth the cost in certain circumstances – but not others. My blog post provides guidance on hiring a paid mentor. - [PowerPoint for Visualizations: Curating Application Pipelines](https://dethwench.com/powerpoint-for-visualizations-curating-application-pipelines/) - [Ask Me Anything About Data Science or Public Health!](https://dethwench.com/ask-me-anything-data-science-public-health/) - Ask me anything about data science or public health every month! Subscribe to my “Ask Me Anything” membership, and get all your questions answered in real time! - [Connecting SAS to Other Applications: Different Strategies](https://dethwench.com/connecting-sas-to-other-applications/) - Connecting SAS to other applications is often necessary, and there are many ways to do it. Read this blog post for a couple of use-cases of SAS data integration using various SAS components. - [Adding Error Bars to ggplot2 Plots Can be Made Easy Through Dataframe Structure](https://dethwench.com/adding-error-bars-to-plots-in-r/) - Adding error bars to ggplot2 in R plots is easiest if you include the width of the error bar as a variable in your plot data. Read my blog post to see an example. - [Confused when Downloading BRFSS Data? Here is a Guide](https://dethwench.com/guide-to-downloading-brfss-data/) - I use the datasets from the Behavioral Risk Factor Surveillance Survey (BRFSS) to demonstrate in a lot of my data science tutorials. The BRFSS are free and available to the public - but they are kind of buried on the web site. This blog post serves as a "map" to help you find them! - [CitePeeps: Want to Increase Citations to Your Research? Join our Online Community!](https://dethwench.com/citepeeps/) - CitePeeps is a new online community of scientific authors focused on increasing the number of citations to their published works. Join us! - [“Bad Blood” is a Lesson in How Bad Leadership Leads to Bad Data: Part 4 of 5](https://dethwench.com/bad-leadership-leads-to-bad-data/) - As a data science leader, what should you put in place so your organization doesn't end up a data mess like startup Theranos? This blog posts provides guidance. - [“Bad Blood” Demonstrates how a Lack of Product Description Leads to Data Science Misconduct: Part 2 of 5](https://dethwench.com/lack-of-product-description-leads-to-data-science-misconduct/) - This blog post talks about how lack of product description led to data-related misconduct at Theranos, because they could never nail down exactly what they were trying to do. - [US Public Health Alphabet Soup Explained: What is the NIH?](https://dethwench.com/public-health-what-is-the-nih/) - Wondering what we mean by the National Institutes of Health (NIH)? In my blog post, I explain the NIH’s role in appropriating funding for research, and demystify its role in implementing federal priorities. - [US Public Health Alphabet Soup Explained: What is the HRSA?](https://dethwench.com/public-health-what-is-the-hrsa/) - “What is the HRSA?” can be answered two ways: with a short answer, and a long answer. The short answer is that it is the agency that funds public health departments in the United States. The long answer, which I unpack in my blog post, is more nuanced, harrowing, and ultimately, depressing. - [US Public Health Alphabet Soup Explained: What is the SAMHSA?](https://dethwench.com/public-health-what-is-the-samhsa/) - What does the SAMHSA actually do for mental health and substance abuse patients in the US? The answer is, “nothing directly” – however, indirectly, SAMHSA has had a profound impact on behavioral health patients, and the result has not always been positive, as you can read in my blog post. - [US Public Health Alphabet Soup Explained: What is the ONC?](https://dethwench.com/public-health-what-is-the-onc/) - “What is the ONC?” is what I used to ask before I realized it involves health technology. Although ONC just means “Office of the National Coordinator”, this agency is now known as HealthIT.gov, as I explain in my blog post. - [AI on the Edge: What it is, and Data Storage Challenges it Poses](https://dethwench.com/ai-on-the-edge-means-data-storage-challenges/) - “AI on the edge” was a new term for me that I learned from Marc Staimer, founder of Dragon Slayer Consulting, who was interviewed in a podcast. Marc explained how AI on the edge poses a data storage problem, and my blog post proposes a solution! - [Internship Strategy for Data Science: Download our Guide!](https://dethwench.com/internship-strategy-guide-for-data-science/) - Internship strategy for data science is not obvious, and even if you are in a college program, they often expect you to find your own internship. Download our internship strategy guide and get the experience you want! - [CV/Resume Livestream: Slide Presentation](https://dethwench.com/cv-resume-livestream-data-science-public-health/) - CV/resume livestream was held by me recently, because my customers keep asking about the differences between curriculum vitae (CV), resume, and biosketch. My livestream answers all those questions! - [Project Management Terminology for Public Health Data Scientists](https://dethwench.com/application-development-terminology-for-health-data-scientists/) - Project management terminology is often used around epidemiologists, biostatisticians, and health data scientists, and it’s often hard for us to admit we aren’t familiar with some of the terms. Watch my videos and take my Applications Basics course to get up to speed with vocabulary from the health application development domain. - [Rapid Application Development Public Health Style](https://dethwench.com/rapid-application-development-for-health-apps/) - “Rapid application development” (RAD) refers to an approach to designing and developing computer applications. In public health and healthcare, we are not taught about application development – but it’s good for us to learn about it, since we have to deal with data from health applications. My blog post talks about the RAD approach I - [Convert CSV to RDS When Using R for Easier Data Handling](https://dethwench.com/convert-csv-to-rds-in-r-for-easier-import-export/) - Convert CSV to RDS is what you want to do if you are working with big data files in R GUI and want to improve efficiency. Read my blog post for an explanation and video demonstrations of this process! - [Making Upset Plots with R Package UpSetR Helps Visualize Patterns of Attributes](https://dethwench.com/making-upset-plots-in-r-with-upsetr/) - Making upset plots with R package UpSetR is an easy way to visualize patterns of attributes in your data. My blog post demonstrates making patterns of co-morbidities in health survey respondents from the BRFSS, and walks you through setting text and color options in the code. - [Wiley’s Predatory Behavior: My Recent Experience and Recommendations](https://dethwench.com/wileys-predatory-behavior-with-scientific-authors/) - Wiley’s predatory behavior recently with a colleague’s scientific manuscript makes me want to avoid publishing in their journals. Read about our experience. - [End-to-End AI Pipelines: Can Academics Be Taught How to Do Them?](https://dethwench.com/end-to-end-ai-pipelines-academics-can-do-it-too/) - End-to-end AI pipelines are being created routinely in industry, and one complaint is that academics can only contribute to one component of the pipeline. Really? Read my blog post for an alternative viewpoint! - [Benchmarking Runtime is Different in SAS Compared to Other Programs](https://dethwench.com/benchmarking-runtime-for-importing-datasets/) - Benchmarking runtime is different in SAS compared to other programs, where you have to request the system time before and after the code you want to time and use variables to do subtraction, as I demonstrate in this blog post. - [GitHub Beginners in Data Science: Here’s an Easy Way to Start!](https://dethwench.com/github-for-beginning-data-scientists/) - GitHub beginners – even in data science – often feel intimidated when starting their GitHub accounts and trying to interact with the web page. Don’t be shy! Catch the highlights from a recent GitHub beginners workshop I held! - [REDCap Mess: How it Got There, and How to Clean it Up](https://dethwench.com/redcap-mess-how-to-clean-it-up/) - REDCap mess happens often in research shops, and it’s an analysis showstopper! Read my blog post to learn my secret tricks for breaking through the barriers and getting on with data analytics! - [Management Tips for Data Scientists](https://dethwench.com/management-tips-for-data-scientists/) - Management tips for data scientists can be used by anyone – at work and in your personal life! Get the details in my blog post. - [WISE Summit 2023: Women Leaders “Created by Courage”](https://dethwench.com/wise-summit-2023-business-intelligence-workshop/) - WISE Summit 2023 at Northeastern University was the biggest and best one so far! I was honored to lead a business intelligence workshop, as I talk about in my blog post. - [Coloring Plots in R using Hexadecimal Codes Makes Them Fabulous!](https://dethwench.com/coloring-plots-in-r-making-your-own-palette/) - Recoloring plots in R? Want to learn how to use an image to inspire R color palettes you can use in ggplot2 plots? Read my blog post to learn how. - [Referring to Columns in R by Name Rather than Number has Pros and Cons](https://dethwench.com/referring-to-columns-in-r-by-name-rather-than-number-has-pros-and-cons/) - Referring to columns in R can be done using both number and field name syntax. Although field name syntax is easier to use in programming, my blog demonstrates how you can use column numbers to make automation easier. - [The Paste Command in R is Great for Labels on Plots and Reports](https://dethwench.com/the-paste-command-in-r-for-making-labels/) - The paste command in R is used to concatenate strings. You can leverage the paste command to make refreshable label objects for reports and plots, as I describe in my blog post. - [Statistics Trivia for Data Scientists](https://dethwench.com/statistics-trivia-for-data-scientists/) - Statistics trivia for data scientists will refresh your memory from the courses you’ve taken – or maybe teach you something new! Visit my blog to find out! - [Application Development Terminology all Health Data Scientists Should Know](https://dethwench.com/application-development-terminology-all-health-data-scientists-should-know/) - [Understanding Legacy Data in a Relational World](https://dethwench.com/doing-data-science-with-legacy-data/) - Understanding legacy data is necessary if you want to analyze datasets that are extracted from old systems. This knowledge is still relevant, as we still use these old systems today, as I discuss in my blog post. - [Front-end Decisions Impact Back-end Data (and Your Data Science Experience!)](https://dethwench.com/front-end-design-impacts-back-end-data/) - Front-end decisions are made when applications are designed. They are even made when you design a survey in SurveyMonkey. What health data analysts often don’t realize is that these decisions have a profound impact on the quality and accuracy of the data that are collected through these front-ends, which is the focus of this blog - [US Public Health Alphabet Soup Explained: What is the MHS?](https://dethwench.com/public-health-what-is-the-mhs/) - “What is the MHS?” is a question not always asked by public health data scientists, but it should be. The MHS – or Military Health System – serves the US military through healthcare facilities in locations where civilians do not have access. I provide an explanation on my blog post. - [Data for Meta-analysis Need to be Prepared a Certain Way – Here’s How](https://dethwench.com/preparing-data-for-meta-analysis/) - Getting data for meta-analysis together can be challenging, so I walk you through the simple steps I take, starting with the scientific literature, and ending with a gorgeous and evidence-based Forrest plot! - [Dumbbell Plot for Comparison of Rated Items: Which is Rated More Highly – Harvard or the U of MN?](https://dethwench.com/dumbbell-plot-for-comparison-of-rated-items/) - Want to compare multiple rankings on two competing items – like hotels, restaurants, or colleges? I show you an example of using a dumbbell plot for comparison in R with the ggalt package for this exact use-case! - [Making Box Plots Different Ways is Easy in R!](https://dethwench.com/making-box-plots-different-ways-is-easy-in-r/) - Making box plots in R affords you many different approaches and features. My blog post will show you easy ways to use both base R and ggplot2 to make box plots as you are proceeding with your data science projects. - [Pie Chart ggplot Style is Surprisingly Hard! Here’s How I Did it](https://dethwench.com/pie-chart-ggplot-style-is-suprisingly-hard/) - Pie chart ggplot style is surprisingly hard to make, mainly because ggplot2 did not give us a circle shape to deal with. But I explain how to get around it in my blog pot. - [US Public Health Alphabet Soup Explained: What is the CMS?](https://dethwench.com/public-health-what-is-the-cms/) - You might wonder what CMS – the Centers for Medicare and Medicaid Services – actually does. This blog post provides an overview of CMS’s role and activity in the US healthcare system. - [US Public Health Alphabet Soup Explained: What is the AHRQ?](https://dethwench.com/public-health-what-is-the-ahrq/) - Want to know what AHRQ stands for, what it does, and how all that relates to US public health? AHRQ is a main player in public health – even though it is technically supposed to be focused on healthcare. - [Payment](https://dethwench.com/dps-payment-page/) - [Native Formats in SAS and R for Data Are Different: Here’s How!](https://dethwench.com/native-formats-in-sas-and-r-data-comparison/) - Native formats in SAS and R of data objects have different qualities – and there are reasons behind these differences. Learn about them in this blog post! - [Data Science Culture vs. Public Health: How Do You Overcome the Difference?](https://dethwench.com/data-science-culture-is-different-from-public-health/) - Data science culture is much faster-paced than the more academic and governmental culture in the public health field. Read my blog post for recommendations as to how public health practitioners can overcome the culture clash! - [Reference Manager Zotero: Slide Presentations](https://dethwench.com/learn-about-recommended-reference-manager-zotero/) - [Pareto Charts: Slide Presentation](https://dethwench.com/learn-about-automotive-and-healthcare-pareto-charts/) - This blog post provides the slides to go with the livestream, “How to Use Pareto Charts in Automotive and Healthcare Industries” held on June 4, 2022 at 11:00 am ET. - [Join MPH Program: Slide Presentation](https://dethwench.com/how-to-join-an-accredited-mph-training-program/) - If you are thinking about applying to a Masters in Public Health (MPH) training program, especially in the United States (US), you want to watch this recorded livestream. I explain the structure of US programs, and how to get into them. - [Build Research Presentation: Slide Presentation](https://dethwench.com/creating-a-research-presentation-from-an-article/) - Giving written feedback can be challenging if this is a new skill you are beginning to practice. Watch the recorded livestream on my blog post where I share my basic guidance on how to efficiently provide useful, effective written feedback to peers, leaders, students, and other professionals. - [Giving Written Feedback: Slide Presentation](https://dethwench.com/giving-written-feedback-slide-presentation/) - Giving written feedback can be challenging if this is a new skill you are beginning to practice. Watch the recorded livestream on my blog post where I share my basic guidance on how to efficiently provide useful, effective written feedback to peers, leaders, students, and other professionals. - [Giving Written Feedback: Slide Presentation](https://dethwench.com/giving-written-feedback-advice-on-being-effective/) - Giving written feedback can be challenging if this is a new skill you are beginning to practice. Watch the recorded livestream on my blog post where I share my basic guidance on how to efficiently provide useful, effective written feedback to peers, leaders, students, and other professionals. - [Peer-review Tips: Slide Presentation](https://dethwench.com/peer-review-tips-to-publish-faster/) - Peer-review tips livestream was held by me recently, because I want to help colleagues shorten their time from draft to publication. In the livestream, I cover some common challenges to scientific publishing, and provide three (3) tips to help overcome them! - [Causal Inference Livestream: Slide Presentation](https://dethwench.com/causal-inference-livestream-apply-bradford-hill/) - Causal inference livestream that I held resulted in a lively discussion! You can download the slides I presented on this blog post. - [Data Curation Solution to Confusing Options in R Package UpSetR](https://dethwench.com/data-curation-solution-to-confusing-options-in-r/) - Data curation solution that I posted recently with my blog post showing how to do upset plots in R using the UpSetR package was itself kind of a masterpiece. Therefore, I thought I’d dedicate this blog post to explaining how and why I did it. - [Slides for US Healthcare System Lecture Series on YouTube](https://dethwench.com/overview-united-states-healthcare-system-lectures/) - From 2012 until recently, I was an adjunct lecturer at Laboure College in Milton, Massachusetts. At that time, I taught a course called, "Fundamentals of US Healthcare Delivery" in person, in a hybrid setting, and entirely online. Textbook Lectures I developed PowerPoint slides and recorded YouTube lectures for Chapters 1, 2, 3, 4, 5, 6, - [Teaching or Taking Healthcare Statistics? Get Curriculum Materials Here!](https://dethwench.com/basic-statistics-resources-lectures-slides-healthcare/) - From 2012 until recently, I was an adjunct lecturer at Laboure College in Milton, Massachusetts. At that time, I taught a course called, “Essentials of Statistics” in person, in a hybrid setting, and entirely online. Purchase Study Materials & Curriculum Textbook Lectures and Demonstration First, I picked out just certain parts of the book - [US Public Health Alphabet Soup Explained: What is the NACCHO?](https://dethwench.com/public-health-what-is-the-naccho/) - You may already know that NACCHO is NOT cheese – but what is it? It’s a professional society for local public health officials. Read my blog post to learn what NACCHO does, and who it serves. - [Two Takeaways from Danny Ma’s Machine Learning Panel: Understanding the Problem, and Understanding your Data](https://dethwench.com/machine-learning-panel-understanding-data/) - This lively panel discussed many topics around designing and implementing machine learning pipelines. Two main issues were identified. The first is that you really have to take some time to do exploratory research and define the problem. The second is that you need to also understand the business rules and context behind the data. - [VP at Data Robot Tells Cautionary Tale of Data Science, AI, and Healthcare](https://dethwench.com/cautionary-tale-data-science-ai-healthcare/) - I encourage those of you into data science and AI to sign up to receive digests from Data Science Central. I happened upon this web site when looking for some references for a book I am writing, and found some amazing articles. Since I’m into data science in and AI in healthcare, I was intrigued - [US Public Health Alphabet Soup Explained: What is the IHS?](https://dethwench.com/public-health-what-is-the-ihs/) - “What is the IHS?” is a reasonable question to ask, because there are a few things that are very special about the IHS and its healthcare facilities. At first glance, these special characteristics may seem positive, but they actually have devastating unintended consequences, as I describe in my blog post. - [US Public Health Alphabet Soup Explained: What is the VA?](https://dethwench.com/public-health-what-is-the-va/) - What is the VA – which stands for Veterans Affairs? This United States federal agency is tasked with ensuring veterans receive their benefits – especially health benefits. Unfortunately, as my blog post explains, the VA is facing a myriad of challenges today, including funding problems as well as corruption. - [Which Independent Variables Belong in a Regression Equation? We Don’t All Agree, But Here’s What I Do.](https://dethwench.com/which-independent-variables-belong-in-a-regression-equation-we-dont-all-agree-but-heres-what-i-do/) - During my failed attempt to get a PhD from the University of South Florida, my doctor friend asked me one day to build a linear regression model using a small dataset he had collected from a lab. He had measurements of these “new” chemical messengers called cytokines – so that definitely dates this story! I - [Sort Order, Formats, and Operators: A Tour of The SAS Documentation Page](https://dethwench.com/sort-order-format-operator-sas-documentation-page/) - Get to know three of my favorite SAS documentation pages: the one with sort order, the one that lists all the SAS formats, and the one that explains all the SAS operators and expressions! - [Wondering if You Will Like Healthcare Research? Try This: Data Collection](https://dethwench.com/will-you-like-healthcare-research-try-data-collection/) - If you are not sure if you will like doing research in healthcare, instead of starting with big data, start with data collection and get to know the data as it comes into the dataset. - [Here is the Statistical Reason why Calculating the Coronavirus Mortality Rate is so Difficult](https://dethwench.com/why-calculating-coronavirus-mortality-rate-is-difficult/) - Since the coronavirus (COVID-19) registered on our public health radar as a communicable infectious disease amongst humans, countries try to calculate their coronavirus mortality rate (otherwise known as case fatality rate). As a result, many different mortality rates have been reported, causing confusion. This article from Business Insider reports country-wide mortality rates that range from - [I Used the R Package EpiCurve to Make an Epidemiologic Curve. Here’s How It Turned Out.](https://dethwench.com/r-package-epicurve-epidemiologic-curve/) - With all this talk about “flattening the curve” of the coronavirus, I thought I would get into the weeds about what curve we are talking about when we say that. We are talking about what’s called an epidemiologic curve, or epicurve for short. And to demonstrate what an epicurve is and what it means, I - [Recommended Model for QA/QI in Healthcare: Epidemiology and Biostatistics, not PDSA! Part 5 of 5](https://dethwench.com/https-dethwench-com-recommended-model-for-quality-in-healthcare-part-5-of-5/) - I describe the three steps of my alternative model to the Plan-Do-Study-Act (PDSA) model for quality assurance/quality improvement (QA/QI) in healthcare. - [Counting Rows in SAS and R Use Totally Different Strategies](https://dethwench.com/counting-rows-in-sas-and-r-use-different-approaches/) - Counting rows in SAS and R is approached differently, because the two programs process data in different ways. Read my blog post where I describe both ways. - [Referring to Variables in Processing Data is Different in SAS Compared to R](https://dethwench.com/referring-to-variables-in-processing-is-different-in-sas-and-r/) - Referring to variables in processing is different conceptually when thinking about SAS compared to R. I explain the differences in my blog post. - [Variable Names in SAS and R Have Different Restrictions and Rules](https://dethwench.com/variable-names-in-sas-and-r-have-different-naming-rules/) - Variable names in SAS and R are subject to different “rules and regulations”, and these can be leveraged to your advantage, as I describe in this blog post. - [Interview Preparation for Data Science Positions: Tips and Tricks](https://dethwench.com/preparing-to-interview-for-data-science-job-positions/) - Interview preparation for data science jobs can involve taking several simple, actionable steps to make yourself feel confident and ready to answer questions with ease. Read my blog post for my tips and tricks! - [If You Want to Increase Conversions, Try my A/B Testing Course on LinkedIn Learning](https://dethwench.com/ab-testing-course-linkedin-learning/) - A/B testing seems straightforward, but there are a lot of picky details. What A and B conditions do you actually test? How long do you run the test? How do you calculate the statistics for the test? Answer your questions by taking this LinkedIn Learning course. - [Need an Online Curriculum in Data Science or Public Health that is Engaging? Here are my Freebies and Hacks!](https://dethwench.com/need-an-online-curriculum-in-data-science-or-public-health/) - Need online curriculum in data science or public health that keeps the learners engaged? I share a links to free resources as well as my hacks to interest high! - [SAS Macros for Beginners: Learn the Basics with my Tutorial Videos!](https://dethwench.com/sas-macros-for-beginners-tutorial-videos/) - Want to get started learning about SAS macros? This blog post provides SAS macros for beginners with video tutorials to walk beginners and code newbies through the basic steps! - [Presentation on Data Collection for Healthcare QA/QI in Chronic Disease](https://dethwench.com/presentation-on-data-collection-for-healthcare-quality/) - Watch a video of my presentation on data collection from chronic disease patients for healthcare quality control and quality improvement – and download the slides! - [US Public Health Alphabet Soup Explained: What is the CEPH?](https://dethwench.com/public-health-what-is-the-ceph/) - What is the CEPH, and how does it relate to the other organizations in US public health? This blog post explains the history and function of the CEPH, and how it connects to the rest of Big Public Health in the US. - [US Public Health Alphabet Soup Explained: What is the APHA?](https://dethwench.com/public-health-what-is-the-apha/) - Curious about the American Public Health Association (APHA) – what it does, and where it fits into the bigger picture of public health organizations? I delve into these topics, and explain how you can get involved. - [US Public Health Alphabet Soup Explained: What is the CDC?](https://dethwench.com/public-health-what-is-the-cdc/) - The United States (US) Center for Disease Control and Prevention (CDC) was in the spotlight during the COVID-19 pandemic. But as I describe in this blog post, it is only as good as its director. - [US Public Health Alphabet Soup Explained: What is the BPHC?](https://dethwench.com/public-health-what-is-the-bphc/) - The United States (US) Bureau of Primary Healthcare (BPHC) is the federal agency that funds our safety net infrastructure serving patients who can’t get on Medicare or Medicaid. I explain how all that works, and the relationship of BPHC to the rest of the public health infrastructure. - [US Public Health Alphabet Soup Explained: What is the ASPPH?](https://dethwench.com/public-health-what-is-the-aspph/) - Are you aware of the ASPPH as a public health organization, but you just don’t know what it does, or how it fits into the bigger picture? I give a quick explainer of the ASPPH and its role in public health education. - [This Course in Explainable AI will Get you Ready for the Future!](https://dethwench.com/course-in-explainable-ai-for-the-future/) - We experience artificial intelligence all the time on the internet in terms of friend suggestions on social media, internet ads that reflect what we have been searching for, and "smart" recommendations from online stores. But the reality is that even the people who build those formulas cannot usually explain why you were shown a certain - [Read Our New Peer-reviewed Paper on the Ketogenic Hypothesis for Lipedema!](https://dethwench.com/ketogenic-hypothesis-for-lipedema-paper/) - Lipedema, a severe metabolic disorder, is more common than originally thought. A non-trivial proportion of women who struggle with obesity actually have undiagnosed lipedema. I am on a research team that just published a peer-reviewed article that presents the ketogenic hypothesis for lipedema, and here, I present a summary. - [Donate to Central Boston Elder Services in GIVE65’s Giving Tuesday Event!](https://dethwench.com/give65s-giving-tuesday-event/) - On #GivingTuesday, donate to Central Boston Elder Services' Little Necessities program! Give early on December 1, 2020, and your donation may be matched through a program arranged by the #GIVE65 senior services crowdfunding platform. - [Review of Snowflake "Data for Breakfast" – Boston, March 4, 2020](https://dethwench.com/review-of-snowflakes-data-for-breakfast-boston/) - Snowflake is a new big data cloud back-end solution, and the company has been holding “Data for Breakfast” meetings in many different cities to introduce data scientists to their product. I went to the meeting held on March 4, 2020 at the Marriott Long Wharf in Boston, and here is my review. Not My First - [Physical College Classrooms are so Yesterday. Why Are We Still Studying Deeper Learning in Face-to-Face Settings?](https://dethwench.com/physical-college-classrooms-are-so-yesterday-why-are-we-still-studying-deeper-learning-in-face-to-face-settings/) - My colleague who is a professor at Fitchburg State University studies deeper learning in face-to-face and online approaches in higher education. The idea is that if educators use deeper learning approaches, the students will learn more efficiently. Others have talked to me about deeper learning, and when I looked into it, I found that the - [After Taking this Online Course, I’m Trying an Instagram Campaign](https://dethwench.com/instagram-campaign-online-course/) - I’m one of those people in the “over age 45” demographic who is not against Instagram, but never really picked it up. Therefore, it’s probably amazing that I’m doing an Instagram campaign. As a user, I’m bad at taking pictures. My arms are too short for selfies. As a consumer, I’m bad at looking at - [Publishing peer-reviewed research: What should it cost?](https://dethwench.com/pay-consulting-publish-research/) - My initial answer: Not as much as I see people paying paying to publish research. I worked at the US Army for a while, and we hired consulting firms to help us publish peer-reviewed research papers. We had the data, and the questions – the consultants just had to analyze it and help us write - [Preparing your Curriculum Vitae for your Faculty Tenure Package? Use My Hacks!](https://dethwench.com/curriculum-vitae-faculty-tenure-package/) - One day, I was riding home in the back of a Lyft and my phone rang with an unfamiliar Florida number. A voice that sounded gruff and vaguely threatening insisted in a heavy accent that I knew who he was. After an escalating back and forth, I realized it really actually was my colleague from ## Pages - [Home](https://dethwench.com/) - DethWench Professional Services (DPS) provides public health data science education and consulting to individuals and businesses in the United States as well as overseas. 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