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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