Experimental investigations commonly begin with a hypothesis, an expectation of what one might find: “We hypothesize that alcohol leads …

In this post, I’ll show how to create GitHub style “waffle” plot in R with the ggplot2 plotting package.
Simulate activity data First, …

Visualizations are great for learning from data, and communicating the results of a statistical investigation. In this post, I …

In this post, I address the following problem: How to obtain regression lines and their associated confidence intervals at the average …

Gerd Gigerenzer writes (in a paper 10 years ago):
“Most researchers, [a prominent textbook author] argued, are not really interested …

The average psychologist’s statistical toolkit is expanding. Multilevel (mixed effects) models are now routinely used where 10 years …

What happens when the eye is passively dislocated? Well, it turns out that the research on that is out (or rather has been out since …

It is common to describe replication studies as “failed” when they don’t yield results in the same direction as the original study, or …

I recently wrote a piece for Scientific American’s mind matters section. I wanted to call it “Why you won’t believe me”, but the …

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