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st: Zeroes and signrank


From   Marcello Pagano <pagano@hsph.harvard.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Zeroes and signrank
Date   Fri, 08 Nov 2002 17:06:19 -0500

Dear Listers,

The signrank command deals with the Wilcoxon signed rank test.
The question I have has to do with ties, or zeroes.
One approach would be to reduce the sample size by the ties,
and proceed.
Another approach is the one taken by Stata.
The difference is in the calculation of the variance: Stata's
approach is more conservative because it yields a larger variance.
Any other reasons for preferring the one approach to the other?

m.p.

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