Table ROT0. Logistic regression test that β=0 for one normally distributed covariate x.

Computed using normal approximation formula given in F.Y. Hsieh (1989) Sample size tables for logistic regression. Statistics in Medicine 8: 795-802. Figure ROT0 shows computations for one example. Range of parameter values evaluated by Hsieh checked for agreement against tables in his paper.

Figure ROT0. In the first column, nQuery Advisor® 7.0 has solved for sample size, in the second column for power.