[Scipy-tickets] [SciPy] #956: Include Fisher exact test for 2x2 contingency tables in scipy.stats

SciPy Trac scipy-tickets@scipy....
Thu Jul 1 19:37:27 CDT 2010


#956: Include Fisher exact test for 2x2 contingency tables in scipy.stats
-------------------------+--------------------------------------------------
 Reporter:  dsimcha      |       Owner:  somebody  
     Type:  enhancement  |      Status:  needs_work
 Priority:  normal       |   Milestone:  0.8.0     
Component:  scipy.stats  |     Version:  0.7.0     
 Keywords:  patch        |  
-------------------------+--------------------------------------------------

Comment(by dsimcha):

 Here's an updated version of this code. The original function was written
 in the D language and ported to Python a while back. I later realized that
 there were some numerical issues in the implementation that were being
 masked because I was using 80-bit precision in the D version. I have fixed
 these and ported the results back to the Python version.

 The following things should be noted:

 1. There is still a little numerical fuzz that's related to Ticket 1218
 (http://projects.scipy.org/scipy/ticket/1218). This is a problem with the
 rest of SciPy?, not this code.

 2. I have not changed the odds ratio estimation. My code currently uses
 the sample odds ratio. R may be using something fancier, like the
 aforementioned conditional maximum likelihood estimate. See
 http://en.wikipedia.org/wiki/Odds_ratio .

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/956#comment:16>
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