Visualizing interaction effects

I recently gave a workshop on data visualization. One of the topics was visualizing interaction effects (or “moderation” analyses). I think it is a great topic because it exemplifies quite well that there is not one solution to all problems. In general, I would argue that trying to visualize interaction effects is great idea. Due […]

How to center in multilevel models

Ever thought about centering your variables before running an regression based analysis? From my personal experiences with students, chances are high that you haven’t. Although a useful data transformation procedure for many different types of statistical analyses, centering is seldom taught in fundamental statistic courses. Although the mathematical principles behind it may seem arbitrary, its […]