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Re: st: sign test output

From   Maarten Buis <>
Subject   Re: st: sign test output
Date   Fri, 18 Jan 2013 14:13:35 +0100

On Fri, Jan 18, 2013 at 1:34 PM, Nahla Betelmal wrote:
> Also, the
> normality test show rejection of normality both before and after I
> winsorized the data

That is not surprising. Based on the simulation I gave you yesterday
you can see that if you had a 1000 observations (rather than 346) and
the data really came from a Gaussian distribution you would still have
a 93% chance of rejecting that true hypothesis at the 5% level!
Rejecting the null hypothesis based on these tests is thus completely
and utterly and totally uninformative. So, don't use these tests in
such small samples.

-- Maarten

Maarten L. Buis
Reichpietschufer 50
10785 Berlin
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