ρ Borm approach non-central F distribution
n per group power n per group power
0 64 0.7941 64 0.7965
0.1 64 0.802 64 0.8019
0.2 62 0.7961 62 0.8057
0.3 59 0.8081 59 0.7988
0.4 54 0.803 54 0.7974
0.5 48 0.7945 49 0.8082
0.6 41 0.7957 42 0.7943
0.7 33 0.7836 34 0.7989
0.8 23 0.7758 24 0.8046
0.9 13 0.7842 14 0.8154
Table 1: alpha=0.05, power=0.8, sd=1, diff=0.5.