[R] sign and sign rank tests

From: John Sorkin <jsorkin_at_grecc.umaryland.edu>
Date: Fri 02 Dec 2005 - 23:13:12 EST

R 2.1.1 on Windows 2K  

I hope one and all will allow both an R question and a general stats question:  

(1) Is there any function that will perform non-parametric tests such as a sign test or a signed rank test? I know I could program both but I would prefer not re-inventing the wheel.

(2) When performing a sign test, the usual practice is to drop zero values. Is there any theoretical reason for doing this? I know it makes life a little easier (i.e. one need not decide how to handle zero values, how to split them between successes and failures) but is there more theory behind this theory?


John Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
Baltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC  

University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
Baltimore, MD 21201-1524  


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