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latest blog posts

Member Training: Introduction to Item Response Theory and Rasch Models

November 1, 2024 • TAF Support

Item Response Theory (IRT) refers to a family of statistical models for evaluating the design and scoring of psychometric tests, assessments and surveys. It is used on assessments in psychology, psychometrics, education, health studies, marketing, economics and social sciences — assessments that involve categorical items (e.g., Likert items). Read More

Member Training: Types of Longitudinal, Repeated Measures, and Time Series

October 2, 2024 • TAF Support

How do you know when to use a time series and when to use a linear mixed model for longitudinal data? What’s the difference between repeated measures data and longitudinal? Read More

Getting Started with Stata Tutorial #6: How Stata Code Works

July 18, 2024 • guest contributer

If you’ve tried coding in Stata, you may have found it strange. The syntax rules are straightforward, but different from what I’d expect. I had experience coding in Java and R before I ever used Stata. Because of this, I expected commands to be followed by parentheses, and for this to make it easy to […] Read More

stat skill-building compass

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