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Re: st: Automatic mean-centering?


From   "Sarah A. Mustillo" <smustillo@psych.duhs.duke.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Automatic mean-centering?
Date   Wed, 25 Aug 2004 15:34:45 -0400

You are probably looking for something more automated or sophisticated, but I usually do something like this:

foreach var in x x1 x2 x3 x4 x5 x6 x7 x8...x100{
egen temp`var'=mean(`var')
gen c`var'=`var'-temp`var'
}

drop temp*

Sarah


Clive Nicholas wrote:


All,

I'm interested in re-running old models by mean-centering all my
continuous variables for comparison, as well as obtaining meaningful
intercept values. At the same time, I wish to include dummy variables
which, for obvious reasons, would not be mean-centered.

Now I know how to do this manually, as we all do:

. gen splodge = spludge-100

where 100 is the mean of SPLUDGE. But I'm interested to know if there's a
quicker way, especially if I have a _lot_ of continuous variables to
mean-centre.

Having explored the help files for -xi- and Mitchell and Ender's -xi3-
(which IS downloadable via SSC, unlike -renvars-!), neither routine
automatically creates mean-centered variables. Searching -findit- _and_
the archive turned up nothing and nothing relevant respectively.

If anyone has any ideas, I'd be keen to hear them. Ta!

CLIVE NICHOLAS        |t: 0(044)191 222 5969
Politics              |e: clive.nicholas@ncl.ac.uk
Newcastle University  |http://www.ncl.ac.uk/geps
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--
Sarah A. Mustillo, Ph.D
Department of Psychiatry and Behavioral Sciences
Duke University School of Medicine
Box 3454
Durham NC 27710

919 687-4686 x231
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