How to use Outlier Tests in R Code

Question

As part of my data analysis workflow, I want to test for outliers, and then do my further calculation with and without those outliers.

I\'ve found the outlier pack

Answer 1

Try the outliers::score function. I don't advise removing the so called outlier's, but knowing your extreme observations is good.

library(outliers)
set.seed(1234)
x = rnorm(10)
[1] -1.2070657  0.2774292  1.0844412 -2.3456977  0.4291247  0.5060559 -0.5747400 -0.5466319
[9] -0.5644520 -0.8900378
outs <- scores(x, type="chisq", prob=0.9)  # beyond 90th %ile based on chi-sq
#> [1] FALSE FALSE FALSE  TRUE FALSE FALSE FALSE FALSE FALSE FALSE
x[outs]  # most extreme
#> [1] -2.345698

You'll find more help with outlier detection here