[R] Gamma for ordinal trends

[Peter Dalgaard]

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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