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In statistics, Cohen's h, popularized by Jacob Cohen, is a measure of distance between two proportions or probabilities. Cohen's h has several related uses: * It can be used to describe the difference between two proportions as "small", "medium", or "large". * It can be used to determine if the difference between two proportions is "meaningful". * It can be used in calculating the sample size for a future study. When measuring differences between proportions, Cohen's h can be used in conjunction with hypothesis testing. A "statistically significant" difference between two proportions is understood to mean that, given the data, it is likely that there is a difference in the population proportions. However, this difference might be too small to be meaningful—the statistically significant result does not tell us the size of the difference. Cohen's h, on the other hand, quantifies the size of the difference, allowing us to decide if the difference is meaningful. == Uses == Researchers have used Cohen's h as follows. * Describe the differences in proportions using the rule of thumb criteria set out by Cohen. Namely, ''h'' = 0.2 is a "small" difference, ''h'' = 0.5 is a "medium" difference, and ''h'' = 0.8 is a "large" difference. * Only discuss differences that have ''h'' greater than some threshold value, such as 0.2. * When the sample size is so large that many differences are likely to be statistically significant, Cohen's h identifies "meaningful", "clinically meaningful", or "practically significant" differences.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cohen's h」の詳細全文を読む スポンサード リンク
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