[R] exact Wilcoxon signed rank test with ties and the "no longerunder development" exactRanksumTests package

[Torsten Hothorn]

On Fri, 25 Aug 2006, Stefan Grosse wrote:

> Dear List,
>

Stefan,

> after updating the exactRanksumTests package I receive a warning that
> the package is not developed any further and that one should consider
> the coin package.
>
> I don't find the signed rank test in the coin package, only the Wilcoxon
> Mann Whitney U-Test. I only found a signed rank test in the stats
> package (wilcox.test) which is able to calculate the exact pvalues but
> unfortunately the procedure cannot calculate the exact values with ties.
>

indeed, this is the only gap to be filled in `coin', I just haven't had 
the time to implement this. And of course, `exactRankTests' is still 
available and will be available in the future. So you _can_ use it!

The message just means that I'm not going to add _new_ features
to `exactRankTests' and that we as the authors of both packages
believe that the `coin'-way of doing things is more appropriate.

Hope that helps & sorry for the confusion!

Torsten

ps: please cc emails about packages to the maintainer.

> Is there any other package that is providing a similiar test? Or is
> there an easy work out how to take the ties into account? (Or a chance
> that the correction is taken into account for the stats package?)
>
> Stefan Grosse
>
> Take the following example from Bortz/Lienert/Boehnke:
>
>> x1<-c(9,14,8,11,14,10,8,14,12,14,13,9,15,12,9)
>> x2<-c(13,15,9,12,16,10,8,13,12,16,9,10,16,12,9)
>
> # exactRankTests package:
>
>> wilcox.exact(x1,x2,paired=TRUE)
>
>        Exact Wilcoxon signed rank test
>
> data:  x1 and x2
> V = 13, p-value = 0.1367
> alternative hypothesis: true mu is not equal to 0
>
> # wilcox.test by stats package:
>
>> wilcox.test(x1,x2,paired=TRUE,exact=TRUE)
>
>        Wilcoxon signed rank test with continuity correction
>
> data:  x1 and x2
> V = 13, p-value = 0.1436
> alternative hypothesis: true mu is not equal to 0
>
> Warning messages:
> 1: cannot compute exact p-value with ties in: wilcox.test.default(x1,
> x2, paired = TRUE, exact = TRUE)
> 2: cannot compute exact p-value with zeroes in: wilcox.test.default(x1,
> x2, paired = TRUE, exact = TRUE)
>
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