Power and sample size
Before you conduct your experiment, determine the sample size needed to detect
meaningful effects without wasting resources. Do you intend to perform tests
of means, variances, proportions, or correlations? Do you plan to fit a
one-way, two-way, or repeated-measures ANOVA model? Do you want to fit a Cox
proportional-hazards model or compare survivor functions using a log-rank test?
Use Stata's power commands or interactive Control Panel to compute power and
sample size, create customized tables, and automatically graph the relationships
between power, sample size, and effect size for your planned study. And much more.