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st: RE: comparing different means using ttest


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: comparing different means using ttest
Date   Thu, 16 Dec 2010 18:02:16 +0000

Maarten pointed out two misconceptions here. I think there are several others. 

If you are using -regress- as here then with standard procedures the mean residual is automatically zero. In any case the mean residual tells you nothing whatsoever about homo- or heteroscedasticity, any more than the mean of anything tells you about its variability. 



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