[R] One Sample Nonparametric

Dieter Menne dieter.menne at menne-biomed.de
Mon May 18 08:16:59 CEST 2009

Charles Van deZande <cvandy26 <at> gmail.com> writes:

> I'm doing one and two sample nonparametric tests for the median using wilcox
> test.  For a one-sample test I  use: 
> > wilcox.test(x, mu =50 (or whatever), y=NULL,correct=TRUE)
> For two-sample test I use: 
> > wilcox.test(x,y,correct=TRUE)
> The problem is when I try to duplicate problems from textbooks, I get
> p-values that are much different from the examples from the literature. 
> They are off by as much as 30% to 40%.  Not even close.
> Using an "exact" argument doesn't change the p-value.

> What am I doing wrong? 

You have not posted the textbook example you tested. You can use
dput to compactly post the data samples. Also check package coin.


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