ρ Borm approach non-central F distribution
n per group power n per group power
0 25 0.7918 26 0.806
0.1 25 0.7891 25 0.7917
0.2 24 0.7874 25 0.8059
0.3 23 0.7966 24 0.8096
0.4 21 0.782 22 0.8037
0.5 19 0.7839 20 0.7996
0.6 16 0.7629 17 0.795
0.7 13 0.7452 14 0.7975
0.8 9 0.6765 11 0.8117
0.9 5 0.5197 7 0.8126
Table 2: alpha=0.01, power=0.8, sd=1, diff=1.