I have a quick (but surprisingly difficult) question to ask regarding transformed variables in an interaction term when conducting regression.

This question was asked previously (as below) however, the answer was slightly incorrect as there are assumptions for multiple regression and one of those is that the data are normally distributed.

I have searched high and low for the answer so any insight or references on this issue would be greatly appreciated.

QUESTION:

I'm performing a multiple regression analysis and have a question about transforming variables.

I am using two IVs to see if there are interaction effects on the DV. I understand its often best to center the IVs before running the regression. Problem is one of my IVs needs to be transformed. So, do I first center the two IVs, and then do the transformation?

thanks so much...

ANSWER:

It is not necessary. I guess it is a cross section data. There is no distribution assumption is required (for IVs) to build multiple regression.