critical regions for the fisher`s exact test in 2×2 tables

CRITICAL REGIONS FOR THE FISHER'S EXACT TEST
IN 2×
×2 TABLES
Use of the tables
x1
y1
n1
x2
y2
n2
a1
a2
N
Given a 2×2 table like the above, in which x1 Æ Hypergeometric and:
N≤ 50,
a1= Min (n1; n2; a1; a2),
x1y2 < x2y1 ≡ x1/n1<x2/n2
the test for H: "not association" is significant if n1≥C, where C is the number indicated
within the table for the combination of values of N, a1, x1, the number of tails and the error
α for the test (in that order). The absence of a value for C (or the presence of "-") is
indicative of "non-significant test" for the error α selected.
For further details see: Martín Andrés, A., Luna Del Castillo, J.D. and Herranz Tejedor, I.
(1991). New critical regions for Fisher's exact test. Journal of Applied Statistics 18 (2),
233-254.