Table MGT1. Single one-way between means contrast (equal n’s)

Power, sample size, or effect size are computed using central and non-central F. For MGT1, the numerator and denominator degrees of freedom are 1 and G(n-1), and the non-centrality parameter is n times the square of the effect size. The effect size is defined in the row title in the table. See O’Brien, R.G., Muller, K.E. (1993) “Unified Power Analysis for t-tests through Multivariate Hypotheses”, in Edwards, L.K. (Ed.), Applied Analysis of Variance in Behavioral Science, Marcel Dekker, New York. Pages 297-344. See nQuery Advisor® manual Appendix for details of computing methods for F and non-central F. Figure MGT1 shows computations for an example checked against MTT0. Additional examples checked against MGT1U and PASS. Extreme values for all the parameters were tested.

Figure MGT1. In the first column, nQuery Advisor® 7.0 solved for sample size, in the second column for power and in the third column for effect size.