Table 1: Relative standard deviation of the desired P value, as function of desired P value and number of permutations.

Number of Permutations/P value 0.1 0.05 0.01

1000 9.48% 13.78% 31.46%
5 000 4.24% 6.16% 14.07%
10 000 3% 4.35% 9.95%
50 000 1.34% 1.94% 4.45%
100 000 0.95% 1.37% 3.14%