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Ridit法可用于计数资料的分析，更适宜于等级资料的比较，与常用的卡方检验相比．它不但能说明各组的构成不同，还能对比各组的优劣．并且能图示．使结果一目了然。本文应用Ridit法对1994年上海市宝山区3所中学（行知中学、宝钢三中、培新中学）3所小学（月浦一小、友谊路小学?
Ridit method can be used to count data analysis, more suitable for the level of data comparison, compared with the commonly used chi-square test. It can not only explain the different composition of each group, but also compare the pros and cons of each group. And can be illustrated. Make the result clear at a glance. This article applies Ridit to analyze three primary schools (Yuepu Primary School and Youyi Road Primary School) in 3 secondary schools (Xingzhi Middle School, Baosteel Middle School and Peixin Middle School) in Baoshan District, Shanghai in 1994.