Hi all!
After looking back over the PowerPoint slides from the transformations lecture today, I realized that I made a change to a slide, but forgot to mention it. Your print-out of the slides needs to be modified at one point.
If you look at the first slide on centering, it states "To center: Y i centered = Yi – Mi." It should actually read, "To center: X i centered = Xi – Mi" We only ever center predictors, and X stands for our predictors, while Y stands for our outcome variables. To center, subtract each value of the predictor from the mean of the predictor (or some other meaningful value). Sorry for the confusion.
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