[R] Gamma for ordinal trends

[Wuming Gong]

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 at biostat.ku.dk> wrote:
> Jonathan Baron <baron at 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.
> 
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