From katrina.chu at unb.ca  Wed Oct 29 15:05:05 2008
From: katrina.chu at unb.ca (katrina.chu at unb.ca)
Date: Wed, 29 Oct 2008 15:05:05 +0100 (CET)
Subject: [Rd] cochran.test {outliers} (PR#13227)
Message-ID: <20081029140505.7F00E282C787@mail.pubhealth.ku.dk>

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) (131.202.107.54)


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.



[Rd] cochran.test {outliers} (PR#13227)
katrina.chu at unb.ca