Table PTE0. Two group test of equivalence in proportions (equal n’s)

Computed using the large sample normal approximation shown in the nQuery Advisor® manual appendix, see Machin D, Campbell MJ (1987) Statistical Tables for the Design of Clinical Trials, Blackwell Scientific Publications Oxford for formula, references and table. Figure PTE0 shows computations for three examples. Solutions for n for significance level .01,.1, one and two-sided, proportion in group 1 .05, proportion in group 2 of .1,.5, .8, power of 50%, 80%, 99% checked for exact agreement against Table 4.1 in Machin D, Campbell MJ (1987) Statistical Tables for the Design of Clinical Trials, Blackwell Scientific Publications Oxford.

Figure PTE0. In columns one, two and four, nQuery Advisor® 7.0 has solved for sample size, in column three, nQuery Advisor® 7.0 has solved for power.