[R] effect sizes for Wilcoxon tests

[Peter Dalgaard]

Claus Atzenbeck <claus.atzenbeck at freenet.de> writes:

> On Mon, 14 Nov 2005, Claus Atzenbeck wrote:
> 
> > However, for Wilcoxon tests, the formula for effect sizes is:
> > r = Z / sqrt(N)
> >
> > I wonder how I can calculate the Z-score in R for a Wilcoxon test.
> 
> Does anyone know how to calculate effect sizes for Wilcoxon tests as
> SPSS can do? I wonder if it would be very difficult to do so with R.

If the above formula is correct, it can't be hard. What I wonder is
whether (and if so, how) it makes sense. (& the fact that SPSS does it
is no guarantee...)

-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907