Hello, I am examining three variables to see whether they interact with each other to predict my DV using multiple regression. I typically center my variables to make interpretation easier. I was wondering, if my three IVs (let's call them X, Y, and Z) are all centered, then when creating the interaction terms (e.g., XY, XZ, YZ, and XYZ), do I use the uncentered or centered variables? Also, how does one go about probing the three way interaction if significant? Any info would be great! Thanks!