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 effects on results are oftentimes quite strong. Centering is useful in standard statistical modeling (e.g., OLS regression), but its usefulness… Read More »How to center in multilevel models
If you have ever been on this website before, you might realize that the design changed slightly and some new contents appear on a couple of sites. Yes, I did move to wordpress. Although it was great fun to create this website from scratch and keep it simple and fast by implementing only basic html and css, I nonetheless missed some more elaborate functions that I could not program myself (e.g., comments, tags, categories, footnotes…).… Read More »Hello and welcome back!