Table 1 Computed sample size, estimated power, and difference for the exact and approximate procedures with {βI, βS} = {4.1, 0.15}, {βI0, βS0} = {4.198, 0.143}, σ2 = 0.095, μX = 24.2, \( {\sigma}_X^2 \) = 6, and Type I error α = 0.05
From: Sample size calculations for model validation in linear regression analysis
Nominal power | Exact approach | Approximate method | Difference | |||
|---|---|---|---|---|---|---|
N | Estimated power | N | Estimated power | N | Power | |
0.80 | 173 | 0.8001 | 183 | 0.8236 | 10 | 0.0235 |
0.90 | 227 | 0.9010 | 239 | 0.9161 | 12 | 0.0151 |