[R] Outlier statistics question

Jahan jahan.mohiuddin at gmail.com
Tue Nov 30 21:15:40 CET 2010

I have a statistical question.
The data sets I am working with are right-skewed so I have been
plotting the log transformations of my data.  I am using a Grubbs Test
to detect outliers in the data, but I get different outcomes depending
on whether I run the test on the original data or the log(data).  Here
is one of the problematic sets:

#This next step requires you have the 'outliers' package
#the output says p<0.05 so 5.047 is an outlier
#Next, I run the test on the log(data)
#output is that p>0.05 so we reject that there is an outlier.

The question is, which outlier test do I accept?

More information about the R-help mailing list