[R] 3 little questions

[Liaw, Andy]

> From: Siegfried.Macho
> 
> Dear R-helpers,
> 
> 3 questions:
> 1. Is there a package that contains a routine for computing 
> Kendall's W 
> (coefficient of concordance), with and without ties ?

Is that the same as Kendall's tau, as in cor(..., method="kendall")?

> 2. Is there a package that contains a routine for computing 
> Goodman' s Gamma.

Don't know, if you can find out by search on CRAN.

> 3. I there a simple method for computing the number of ties 
> as well as their lengths within a vector fo ranks,
> e.g.
>  >r1 <- rank(c(1, 3, 2, 3, 3, 2, 4))
> 
> gives:
> 
> [1] 1.0 5.0 2.5 5.0 5.0 2.5 7.0
> 
> which contains 2 ties with length 2 and 3.

Try table(), which gives you frequencies.

HTH,
Andy
 
> Thanks in advance,
> S.M
> 
> 
> ==============================================
> Dr. Siegfried Macho
> Department of Psychology
> University of Fribourg
> Rue de Faucigny 2
> CH-1700 Fribourg
> 
> Tel.: +41-26-3007635
> Fax.: +41-26-3009712
> http://www.unifr.ch/psycho/general/macho.htm
> 
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