统计效力：一个统计能够正确拒绝虚无假设的能力，表示为1-β。
Statistical validity: the ability of a statistic to correctly reject a null hypothesis, denoted 1-β.
统计效力的取值与效应大小、被试的组数和每组被试的人数有关。
Statistical validity takes values related to effect size, number of groups of subjects, and number of subjects per group.