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latest blog posts

Member Training: Exact and Randomization Tests

June 2, 2023 • guest contributer

Exact and randomization tests are simple from a conceptual level and need fewer assumptions than traditional parametric tests. They do require substantial computing power, but nothing that can’t be handled by the computer you have today. Read More

The Difference Between Clustered, Longitudinal, and Repeated Measures Data

May 22, 2023 • Karen Grace-Martin

In repeated measures data, the dependent variable is measured more than once for each subject. Usually, there is some independent variable (often called a within-subject factor) that changes with each measurement. And in longitudinal data, the dependent variable is measured at several time points for each subject, often over a relatively long period of time. Read More

A Post-hoc Test for Kruskal-Wallis

May 8, 2023 • guest contributer

If you’ve ever run a one-way analysis of variance (ANOVA), you’re familiar with post-hoc tests. The ANOVA omnibus test only tells you whether any groups differ in their means. But if you want to explore which specific group mean is different from which, you need to follow up with a post-hoc test. Read More