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Re: st: Fisher's exact test

From   Maarten Buis <>
Subject   Re: st: Fisher's exact test
Date   Tue, 13 Sep 2011 09:20:46 +0200

On Mon, Sep 12, 2011 at 6:52 PM, Beatrice Crozza wrote:
> I would like to compute the ratio between the mean trading volume
> around announcements and the mean trading volume at the same time of
> the day on non-announcement days.
> I want than to test if these two means are significantly different at 5% level.
> I read this post:
> Since when there is the news I have only 5 obs, I want to use the
> Fisher’s exact test.

the Fisher's exact test is for cross-tabulations not for comparisons
of means, so it is not appropriate for your problem.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

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