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Re st: Wilcoxon signed-rank test for clustered data
From
"Ariel Linden, DrPH" <[email protected]>
To
<[email protected]>
Subject
Re st: Wilcoxon signed-rank test for clustered data
Date
Tue, 5 Oct 2010 10:33:14 -0700
I suggest you take a look at Roger Newson's excellent suite of programs,
-somersd-, -cendif-, and -censlope-
All of these programs will perform what you are asking for, and will allow
clustering (to address your concerns about within group correlation) as well
as weights, if you need them.
I hope this helps
Ariel
Date: Tue, 5 Oct 2010 10:15:59 +0530
From: "Harsha" <[email protected]>
Subject: st: Wilcoxon signed-rank test for clustered data
Dear All,
I have a data comparing a few parameters in a group of patients before and
after a particular surgery. These surgeries are done on both eyes of a few
patients resulting in a correlated data. A few variables which I am trying
to compare are non-parametric. I am trying to apply Wilcoxon signed rank
test but am faced with the problem of the observations being not independent
between the 2 eyes of the patients. There is a program on SAS by Rosner's
group to use Wilcoxon for clustered data. Is there something similar in
stata? Is there any other ways to compare the medians between groups in
correlated data?
Kindly suggest.
Harsha
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