Re: [R] Gamma for ordinal trends

From: Wuming Gong <wuming.gong_at_gmail.com>
Date: Wed 31 Aug 2005 - 21:55:19 EST

Is it possible to use delta method to evaluate the standard error of Goodman-Kruskal gamma and then Wald test to evaluate the significance of association?

Wuming

On 31 Aug 2005 13:42:27 +0200, Peter Dalgaard <p.dalgaard@biostat.ku.dk> wrote:
> Jonathan Baron <baron@psych.upenn.edu> writes:
>
> > On 08/31/05 17:46, Wuming Gong wrote:
> > > Dear list,
> > >
> > > Are there any functions for calculating gamma (and its standard
> > > error), which measures the association of ordinal factors in I x J
> > > contingency table. I did a RSiteSearch but did not find any clues...
> >
> > You have to look for Goodman-Kruskal gamma. It is a bit
> > obscure. It is rcorr.cens in the Hmisc package.
> >
> > The significance test is the same as for Kendall's tau, according
> > to some books.
>
> Well, it would be if we handled ties in Kendall's tau correctly...
>
> > I don't know about standard error.
>
> --
> O__ ---- Peter Dalgaard ุster Farimagsgade 5, Entr.B
> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907
>



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