[求助]卡方检验问题！

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俺是新手，问题比较初级

在卡方检验中，有个expected values,下面有两个选项，一个是所有分组的期望值都相同

一个是需要输入数值的，我学习的书本上说，需要输入“相应各组所对应的由给定分布计算所得的期望值百分比”

这个是个什么东东，怎么计算出来的啊？

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关键词：卡方检验 Expected values expect value 检验

所谓Expected value，参考http://www.ats.ucla.edu/stat/Spss/whatstat/whatstat.htm

并比较其与http://www.psych.northwestern.edu/Misc/spss/chi.htm中的问题和方法，就应该清楚了

认真回顾一下chi-square distribution和 chi-square test的本质，将有助理解上面内容

By default, all categories have equal expected values. Categories can have user-specified expected proportions. Select Values, enter a value greater than 0 for each category of the test variable, and click Add. Each time you add a value, it appears at the bottom of the value list. The order of the values is important; it corresponds to the ascending order of the category values of the test variable. The first value of the list corresponds to the lowest group value of the test variable, and the last value corresponds to the highest value. Elements of the value list are summed, and then each value is divided by this sum to calculate the proportion of cases expected in the corresponding category. For example, a value list of 3, 4, 5, 4 specifies expected proportions of 3/16, 4/16, 5/16, and 4/16.