Tag: mean-centering

How to Mean Center Predictors in SPSS?

For testing moderation effects in multiple regression, we start off with mean centering our predictors:mean centering a variable is subtracting its mean from each individual score.After doing so, a variable will have a mean of exactly zero but is not affected otherwise: its standard deviation, skewness, distributional shape and everything else all stays the same. After mean […]

How to Compute Means in SPSS?

This tutorial shows how to compute means over both variables and cases in a simple but solid way. We encourage you follow along by downloading and opening restaurant.sav, part of which is shown below. Quick Data Check Before computing anything whatsoever, we always need to know what’s in our data in the first place. Skipping this […]