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Re: st: mean centering


From   David Hoaglin <dchoaglin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: mean centering
Date   Mon, 21 Jan 2013 12:53:24 -0500

Richard,

Part of the students' problem comes from their thinking that their
model controls for female*income when it actually adjusts for the
contribution of female*income.  They associate "controls for
female*income" with holding female*income constant, but that is not
what multiple regression does.

David Hoaglin


>
> I started teaching centering because my students were making statements like
> "once you control for female*income, the effect of female becomes
> insignificant." But centering also makes the results more intelligible.
>
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