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st: mean centering


From   James Bernard <jamesstatalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: mean centering
Date   Sun, 20 Jan 2013 21:07:42 +0800

Hi,

I know that mean centering is not really a remedy for the resultant
multidisciplinary among interaction effect variables. But, it has
become a common practice. I have two questions:

1- In the case of panel data: should we deduct the mean of all the
observations of that particular variables or should we do this by
groups of observation?

2- is there any direct command in Stata for mean centering?

Thanks,
james
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