列出数据框中每个变量的异常值

Question

我有一个包含 8 个变量的数据框 (x1, x2.. x8)

我想使用以下方法获取箱线图的异常值：

boxplot(dataframe, plot=FALSE)$out

我想要的输出是让数据框列出每个变量的异常值。如下：

variable outlier
x1       outlier1 from x1
x1       outlier2 from x1
x1       outlier3 from x1
x1       outlier4 from x1
x2       outlier1 from x2
x2       outlier2 from x2
x2       outlier3 from x2
.
.
.
x8       outliern from x8

感谢您的支持，

Answer 1

这是你想要的吗？

> testdata <- data.frame(x1=runif(1e3),x2=rnorm(1e3),x3=rnorm(1e3))
> temp <- boxplot(testdata,plot=F)
> cbind(temp$group,temp$out)
      [,1]      [,2]
 [1,]    2  2.765277
 [2,]    2  2.754730
 [3,]    2 -2.714811
 [4,]    2  3.257889
 [5,]    3  2.605549
 [6,]    3 -3.261950
 [7,]    3 -3.057532
 [8,]    3  2.820352
 [9,]    3  2.602933
[10,]    3  2.580897
[11,]    3  2.899350