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latest blog posts

Anatomy of a Normal Probability Plot

June 19, 2025 • Karen Grace-Martin

Across the bottom are the observed data values, sorted lowest to highest. You can see that just like on the histogram, the values range from about -2.2 to 2.2. (Note, these are standardized residuals, so they already have a mean of 0 and a standard deviation of 1. If they didn’t, the plot would standardize them before plotting). Read More

Member Training: Introduction to Data Analysis using R Tutorial

June 12, 2025 • TAF Support

This month we are featuring a 9-module software tutorial by Kim Love: An Introduction to Data Analysis using R. It’s perfect for people who: have never used R before, need to refresh their R skills after not using it for while, have figured out R on their own and would like a more systematic tutorial Read More

Getting Started with Stata Tutorial #12: Changing Variables to and from Strings

May 29, 2025 • TAF Support

From the last post in this series, you should know how to change between numeric types and easily change numeric data.  We’ll now expand your type-changing skills to include changing string variables with two new commands.   Read More

stat skill-building compass

Find clarity on your statistics journey. Try the new tool Stat Skill-Building Compass: Find Your Starting Point!