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Re: st: Wilcoxon symmetry


From   "Simone Spleis" <simonespleis@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Wilcoxon symmetry
Date   Sun, 07 Mar 2010 16:13:30 +0100

Hello Kaspar,

thank you very much for the response! Yes, I do know about the Corrado test, however, it is a longitudinal test. Since I need to check for heteroskedasticity, I would also like to implement a cross-sectional test.

Best,

Simone


 
-------- Original-Nachricht --------
> Datum: Sun, 7 Mar 2010 08:13:57 +0100
> Von: Kaspar Dardas <kaspar.dardas@googlemail.com>
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: st: Wilcoxon symmetry

> Hi Simone,
> 
> check out Corrado’s (1989) rank test.
> 
> CORRADO, C.J. (1989), A non parametric test for abnormal security
> price performance in
> event studies, Journal of Financial Economics, vol. 23: pp. 385-395.
> 
> Please let m know if this has helped.
> 
> Best,
> 
> Kaspar
> 
> 2010/3/6 Simone Spleis <simonespleis@gmx.de>
> >
> > Dear all,
> >
> > I am implementing an event study and testing absolute(!) abnormal
> returns since I cannot classify the news (positive or negative). Now I am trying
> to find a cross-sectional test for detecting abnormal returns on the event
> date. In a paper I read that the author implemented the
> Wilcoxon-signed-rank-test for the event date. But this test assumes a symmetric distribution,
> or am I mistaken? Since absolute abnormal returns will not be symmetric
> (something close to a half-normal-distribution) I am therefore looking for a
> test that does the trick to avoid the symmetry assumption and still detects
> abnormal performance.
> >
> > I would greatly appreciate a hint!
> >
> > Best regards,
> >
> > Simone
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