统计功效与分析软件

一、背景的说明统计功效（ＳｔａｔｉｓｔｉｃａｌＰｏｗｅｒ）是统计学中的一个重要概念，也是一个十分有用的测度指标。国外的许多教科书中对统计功效有过比较详细的讨论，国内出版的教科书中对此也有涉及（参见：袁卫等编著《新编统计学教程》，经济科学出版社，１９９９年２月）。简单地说，统计功效是指，在假设检验中，拒绝原假设后，接受正确的替换假设的概率。我们知道，在假设检验中有α错误和β错误。α错误是弃真错误，β错误是取伪错误。取伪错误是指，拒绝原假设后，接受错误的替换假设的概率。由此可知，统计功效等于１－β。…

Statistical Power and Related Analytical Softwares

Statistical power is a very important measurement for statistical test, but one major obstacle to use of power analysis is the perceived lack of computer software. This is designed to remove this obstacle, by reviewing several free packages that calculate power or sample size and determining which are likely to be of use to researchers.