Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: mean centering

From   Aljar Meesters <>
Subject   Re: st: mean centering
Date   Sun, 20 Jan 2013 16:15:22 +0100

Dear James,

I think that in general one centers variables to make the
interpretation of the marginal effects, conditional on the averages,
Centering variables in a pane should be based on the means of all the
observations of the particular variables and never by groups. If you
deducted the means of groups, you are carrying out a within
transformation, which will lead to a fixed effects model, which is
certainly not your goal of centering the variables.
You can do this by:
egen meanvar = mean(var)
gen centered_var = var - meanvar



2013/1/20 James Bernard <>:
> 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
> *
> *   For searches and help try:
> *
> *
> *
*   For searches and help try:

© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index