[R] Outlier statistics question

2010-11-30 Thread Jahan
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

Re: [R] Outlier statistics question

2010-11-30 Thread Joshua Wiley
Hi Jahan, What data are you going to use for analyses? The original data or the log transformed? It does not make sense to evaluate your transformed data for analysis based on the original untransformed data (unless you are planning on using the untransformed for the analyses). There is a

Re: [R] Outlier statistics question

2010-11-30 Thread Nordlund, Dan (DSHS/RDA)
-Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- project.org] On Behalf Of Jahan Sent: Tuesday, November 30, 2010 12:16 PM To: r-help@r-project.org Subject: [R] Outlier statistics question I have a statistical question. The data sets I am working

Re: [R] Outlier statistics question

2010-11-30 Thread Bert Gunter
(Apologies to all. I am weak and could not resist) On Tue, Nov 30, 2010 at 12:15 PM, Jahan jahan.mohiud...@gmail.com wrote: 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

Re: [R] Outlier statistics question

2010-11-30 Thread Ravi Varadhan
School of Medicine Johns Hopkins University Ph. (410) 502-2619 email: rvarad...@jhmi.edu - Original Message - From: Bert Gunter gunter.ber...@gene.com Date: Tuesday, November 30, 2010 4:22 pm Subject: Re: [R] Outlier statistics question To: Jahan jahan.mohiud...@gmail.com Cc: r-help@r

Re: [R] Outlier statistics question

2010-11-30 Thread Mike Marchywka
- - - - - - From: rvarad...@jhmi.edu To: gunter.ber...@gene.com Date: Tue, 30 Nov 2010 22:53:43 -0500 CC: r-help@r-project.org; jahan.mohiud...@gmail.com Subject: Re: [R] Outlier statistics question It is, perhaps, more apt to call the tests of outliers as tests of outright