R help - Dec 2005 - sign and sign rank tests

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 
 
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
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
 
410-605-7119 
- NOTE NEW EMAIL ADDRESS:
jsorkin@grecc.umaryland.edu


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See Wilcox.test and Wilcox_test functions.

Jarek Tuszynski


-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of John Sorkin
Sent: Friday, December 02, 2005 7:13 AM
To: r-help at stat.math.ethz.ch
Subject: [R] sign and sign rank tests


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 
 
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
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
 
410-605-7119 
-- NOTE NEW EMAIL ADDRESS:
jsorkin at grecc.umaryland.edu


	[[alternative HTML version deleted]]

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