Hi!
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?  Thanks for any help.
cvandy
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Charles H Van deZande
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