help chi2power -------------------------------------------------------------------------------------------------------------------------- Title chi2power -- Compute power for contingency tables. Syntax chi2ower [, options] options description -------------------------------------------------------------------------------------------------------------------- startf(#) Starting sample size factor endf(#) Ending sample size factor incr([#) Increment for sample size factor alpha(#) Alpha level (default is 0.05) -------------------------------------------------------------------------------------------------------------------- Description chi2power computes power for contingency tables using the observed likelihood-ratio chi-square as the noncentrality parameter for a noncentral chi-square distribution. Examples . tabi 35 35 20 10, row lrchi2 . chi2power . chi2power, startf(1) endf(5) . chi2power, startf(1) endf(5) incr(.5) . chi2power, startf(1) endf(5) incr(.5) alpha(.01) Author Philip B. Ender UCLA Statistical Consulting Group ender@ucla.edu