列表離羣值在數據幀

Question

我有8個變量（X1，X2 ... X8）的數據幀

我想使用獲得的箱線圖的離羣值：

boxplot(dataframe, plot=FALSE)$out 

我的期望輸出是讓數據框列出每個變量的異常值。具體如下：

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 

感謝您的支持，

Answer 1

這是你想要的嗎？

> 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