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Re: st: Fisher's exact test


From   Israel Arroyo <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: Fisher's exact test
Date   Thu, 3 Apr 2014 19:19:41 +0200

Fisher's exact test is true under the sharp null hypothesis(of no effect at the unit level). If that H0 is useful depends on the case at hand.
El 03/04/2014, a las 18:31, "Gwinyai Masukume" <[email protected]> escribió:

> Hi,
> 
> According to some experts, "The traditional Fisher's exact test should
> practically never be used."
> Lydersen S, Fagerland MW, Laake P. Recommended tests for association
> in 2 x 2 tables. Stat Med. 2009; 28(7):1159-75.
> http://www.ncbi.nlm.nih.gov/pubmed/19170020
> 
> The convention seems to be if any of the boxes in a 2x2 table has less
> than 5 entities Fisher's exact test should be used.
> 
> When is it correct/appropriate to use Fisher's exact test?
> 
> With thanks,
> Gwinyai
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