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Re: st: Differences in regression slopes

From   Richard Williams <>
Subject   Re: st: Differences in regression slopes
Date   Wed, 20 Feb 2008 17:57:52 -0500

At 01:34 PM 2/20/2008, Austin Nichols wrote:

Keele & Park, 2006)."  Some of this work is peer-reviewed and some
not, but in every case, caveat lector.
Adding to Austin's list: For another explanation of the problem along with a different proposed solution, see J. Scott Long's presentation at

I view Long's approach as sort of high tech descriptive statistics. It will tell you if differences exist between groups, but it leaves open the question as to why the differences are there (differences in effects or differences in residual variation?) I find it kind of unsatisfactory in that it doesn't provide a stronger causal explanation of differences, but then again that is probably better than a causal explanation whose estimates are wrong.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
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EMAIL: Richard.A.Williams.5@ND.Edu

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