Algorithms and associated FORTRAN subroutines for the Fisher exact probability test are presented. R by C cross-classification tables up to five degrees of freedom are considered. These include the 2 × 2, 3 × 2, 4 × 2, 3 × 3, 5 × 2, and 6 × 2 tables. The use of recursion and an arbitrary initial value ensures computational efficiency.
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