Hi guys. I am working with a doctoral student as a statistics consultant. However, I find myself at a loss for the current situation.
We have a relatively basic path model. Recently it was decided that we needed to include a moderating variable. I'm fine with modeling the basic aspect of the moderator, which is creating an interaction variable (e.g., X1, X2, and X1*X2). The difficulty I'm having is in the concept of mean centering. Can someone enlighten me as to how to do the mean centering process?
Must you know of an interaction before using a moderator or is it acceptable to assume a moderator in you model without testing for interaction?
Thanks in advance for your help.
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