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MyFisher33

03 Jul 2007 (Updated 23 Oct 2009)

A very compact routine to compute Fisher's exact test on a 3x3 matrix

File Information
Description	Fisher's exact test of 3x3 contingency tables permits calculation of precise probabilities in situation where, as a consequence of small cell frequencies, the much more rapid normal approximation and chi-square calculations are liable to be inaccurate. The Fisher's exact test involves the computations of several factorials to obtain the probability of the observed and each of the more extreme tables. Factorials growth quickly, so it's necessary use logarithms of factorials. In Matlab this is very easy using the Gammaln function. The function uses preallocation and vectorization to speed-up the computations. Actually, the function also computes the mid-P correction to make the test less conservative.
MATLAB release	MATLAB 7.3 (R2006b)
Zip File Content
Other Files	license.txt, myfisher33.m

Tags for This File
Everyone's Tags	fisher exact test 3x3 matrix, probability(3), statistics(2), test
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Updates
01 May 2008	waitbar added
27 Jun 2008	6-fold speed up using preallocation
02 Jul 2008	Speeding up using preallocation and gammaln calculation
12 Nov 2008	Changes in help section
26 Nov 2008	Improvements in table enumeration
23 Oct 2009	Actually, the function also computes the mid-P correction to make the test less conservative.

Tag Activity for this File
Tag	Applied By	Date/Time
statistics	Giuseppe Cardillo	22 Oct 2008 09:18:03
probability	Giuseppe Cardillo	22 Oct 2008 09:18:03
fisher exact test 3x3 matrix	Giuseppe Cardillo	22 Oct 2008 09:18:03
probability	Cristina McIntire	12 Nov 2008 14:03:03
statistics	Cristina McIntire	12 Nov 2008 14:03:03
test	Cristina McIntire	05 Dec 2008 14:40:11
probability	Dmitry	03 Oct 2009 08:46:53

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