[R] "negative length vectors are not allowed" in wilcox.exact() and perm.test()

[Ben Bolker]

David Croll wrote:
> 
> I want to compare two datasets and I get the message
> 
> Error in .Call("cpermdist2", ma = as.integer(m), mb = as.integer(col),  :
>   negative length vectors are not allowed
> 
> after specifying the exact test. I'm using the exactRankTests package. Do
> you suggest me using the coin library, or is there anything "wrong" with
> my data?
> 
> 

Hard to say. Reproducible example please ... ?

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