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Re: st: Adjusted R-squared comparison

From   John Antonakis <>
Subject   Re: st: Adjusted R-squared comparison
Date   Wed, 06 Feb 2013 11:49:38 +0100

Can't agree more with you Nick. We should care more about having consistent estimators than high r-squares (i.e., Panagiotis, what I mean here is that we can still estimate the slope consistently even if we don't have a tight fitting regression line). So, I don't know why you are interested in this comparison, Panagiotis. I would think you would be more interested in comparing estimates, as in a Chow test (Chow, G. C. (1960). Tests of equality between sets of coefficients in two linear regressions. Econometrica, 28(3), 591-605). If you are using fixed-effects models, you can model the fixed-effects with dummies and then do a Chow test via suest....see -help suest-.



John Antonakis
Professor of Organizational Behavior
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Faculty of Business and Economics
University of Lausanne
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On 06.02.2013 11:40, Nick Cox wrote:
That's positive advice.

My own other idea is that adjusted R-squares are a lousy basis to
compare two models, even of the same kind. They leave out too much


On Wed, Feb 6, 2013 at 10:37 AM, John Antonakis <> wrote:
I think that the only think you can do is to bootstrap the r-squares and see
if their confidence intervals overlap.

To bootstrap you just do:


sysuse auto
bootstrap e(r2), seed(123) reps(1000) : reg price mpg weight

You will be interested in either:

       e(r2_w)             R-squared within model
       e(r2_o)             R-squared overall model
       e(r2_b)             R-squared between model

See help xtreg with respect to saved results.

Let's see if others have other ideas.
On 06.02.2013 10:22, Panagiotis Manganaris wrote:

I need to compare two adjusted r-squared of the same model for two
different periods of time (each one spans for a period of years). So far, I
have split my data in two groups, those that belong to the period 1998-2004
and those that belong to the period 2005-2011. Then I used xtreg on the same
model for each group of data. I've derived their adjusted r-squared and I
want to know if those two adjusted r-squared are significantly different
from each other.
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