Centering and transforming

#1
Hello,

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 as it has a strong negative skew (via inverting). So, do I first center the two IVs, and then do the inverting to the non-normal IV? Is there a prefered approach?

thanks so much...
 

vinux

Dark Knight
#2
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.