Publisher review:MyFisher - A very compact routine for Fisher's exact test on 2x2 contingency table Fisher's exact test of 2x2 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. The same calculation can be done, in a small fraction of the time, by cross-multiplying two appropriately aligned series of binomial coefficients as exposed by Arthur W. Ghent in American Midland Naturalist, 1972, Vol. 88, Issue 1 (July): 15-27.
The routine coumputes the Power and, if necessary, the sample sizes needed to achieve a power=0.80 using a modified asymptotic normal method with continuity correction as described by Hardeo Sahai and Anwer Khurshid in Statistics in Medicine, 1996, Vol. 15, Issue 1: 1-21. Requirements: · MATLAB Release: R2006b · Statistics Toolbox
MyFisher is a Matlab script for Statistics and Probability scripts design by Giuseppe Cardillo.
It runs on following operating system: Windows / Linux / Mac OS / BSD / Solaris.
Operating system:Windows / Linux / Mac OS / BSD / Solaris
MyFisher script details 
