Gamma for ordinal trends
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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