This paper describes a BASIC computer program which performs Fisher's exact test for significance of association in 2 by 2 tables. Computations are ordered to avoid overflow, even in samples of one thousand observations or more.
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References
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Fisher, R. A. (1934). Statistical methods for research workers (fifth ed.). Edinburgh: Oliver and Boyd.
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Pearson, E. S. and Hartley, H. O. (1962). Biometrika tables for statisticians, (second ed.). Cambridge: University Press.
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Yates, F. (1934). Contingency tables involving small numbers and the chi square test, Supplement to the Journal of the Royal Statistical Society, Series B, 1, 217-235.
