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Re: st: non-normal residuals


From   "JVerkuilen (Gmail)" <jvverkuilen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: non-normal residuals
Date   Tue, 12 Feb 2013 11:01:38 -0500

On Tue, Feb 12, 2013 at 10:36 AM, Xixi Lin <winnielxx@gmail.com> wrote:
> Hi JVerkuilen,
>
> Thanks for your help. I have a question about the skewness. How to
> tell the skewness from the qnorm plot? Or is there any test that I can
> test the skewness of the residuals?

The -qnorm- plot should have all your points fall mostly on a line. If
you have skew it'll pull away from the line near one extreme or the
other. This should be in any good regression textbook. Use a density
plot, boxplot, or a histogram as well. All are useful. None are
definitive.
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