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富雅楠 · 2021年10月19日

为什么是用卡方检验

  1. CFA I
  2. Quantitative

NO.PZ2021071601000002

问题如下：

An analyst group follows 250 firms and classifies them in two dimensions. First dimension is financial leverage, and the second dimension is growth/value types.

To test whether the growth/value typles and financial leverage groups are independent of one another, what is the appropriate test statistic to use in this type of test?

选项：

A. Chi-square test

B. T test

C. F test

解释：

A is correct

The appropriate test statistic is ：


where Oij represents the observed frequency for the i and j group and Eij represents the expected frequency for the i and j group if the groupings are independent.

本题选用的检验量为卡方检验。

能详细解释一下吗？没看出来哪里显示出用卡方
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2 个答案

星星_品职助教 · 2021年11月12日

@欢欢

一级所有学过的检验里，只有卡方检验可以检验独立性。

星星_品职助教 · 2021年10月20日

同学你好，

根据题干提示“To test whether the growth/value typles and financial leverage groups are independent of one another”，可以看出来这是在检验independence。

只有卡方检验可以检验独立性，其余无论是T还是F检验都没有这个功能

欢欢 · 2021年11月12日

“只有卡方检验可以检验独立性”这个在PPT哪里提及的呢

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