[Rd] cochran.test {outliers} (PR#13227)

From: <katrina.chu_at_unb.ca>
Date: Wed, 29 Oct 2008 15:05:05 +0100 (CET)

Full_Name: Katrina Chu
Version: R 2.7.2 GUI 1.25 (5217)
OS: Mac OS X Version 10.4.11 (Tiger)
Submission from: (NULL) (

I've been using Cochran's Test to check for outlying variance. I noticed that the degrees of freedom that are calculated and output are incorrect. The author has forgotten to take into account that df=n-1 and appears to have just left df=n. n=# samples per treatment and in the case where n is unequal across treatments, I believe that the average samples per treatment can be calculated, then minus 1.

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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Wed 29 Oct 2008 - 16:20:39 GMT

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