Date: Fri, 17 May 1996 08:08:00 PDT
Reply-To: Paul Robertson <pfr@ALLP.COM>
Sender: "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From: Paul Robertson <pfr@ALLP.COM>
Subject: Wilcoxon test
Thanks to John Whittington, Robert Ableson, Lawrence Muhlbaier, and
Anupama Narayan for answering my question concerning the WMW
test and tied-ranks.
According to Dr. Narayan of SI, the new exact test (added in v6.9 for
mainframes and 6.11 for windows) produces valid p-values even with
tied ranks. Dr Narayan made this statement in a paper delivered at
Robert Ableson suggested Rupert Miller's book _Beyond ANOVA:
Basics of Applied Statistics_ (Wiley) as a useful reference for
identification of when asymptotic theory, and the older test, may
not be valid.