A Rapid FORTRAN Subroutine for the Fisher Exact Probability Test
Kenneth J. Berry, Paul W. Mielke · Educational and Psychological Measurement · 1983
Presented in the paper are a technical description, a recursion algorithm, and a FORTRAN computer subroutine to compute the one-and two-sided probability values for the Fisher exact probability test. The probability values are calculated recursively, without recourse to factorial expressions; consequently, a vast improvement in computational speed is achieved over previously published algorithms.