R中的点双双相关 [英] Point-Biserial Correlation in R

问题描述

我有如下示例数据(230条记录):

I have sample data (230 records) that looks like this:

Salary  Success - Failure
23,300  1
44,000  1
12,400  0
23,000  1
55,000  0
    …
Success =1  

Fail = 0    

我正在尝试将连续变量(工资)与二进制变量(成功-失败–依赖)相关联我需要一个使用Point-Biserial Correlation的上述数据集的示例R代码.

I am trying to correlate a continuous variable (salary) with a binary one (Success -Failure – dependent) I need a sample R –code for the above data set using Point-Biserial Correlation.

推荐答案

我想您的 data.frame 是 df :

X = df$Salary
Y = df[,2]

a = sqrt(sum(Y)*(1-sum(Y))/(length(Y)**2))

point.bis.corr = a*(mean(X[Y==1])-mean(X[Y==0]))/sd(X)

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