From help-request at octave dot org Mon Nov  7 21:17:19 2005
Subject: tetrachoric and polychoric correlations
From: Mike Miller <mbmiller at taxa dot epi dot umn dot edu>
To: Help-Octave List <help at octave dot org>
Date: Mon, 7 Nov 2005 21:09:42 -0600 (CST)

Do we have any Octave code for computing tetrachoric and polychoric 
correlations from cross-tabulated data?

R has a package (under GPL) called "polycor":

http://cran.r-project.org/src/contrib/Descriptions/polycor.html

R also has a package for working with MV normal and t distributions:

http://cran.r-project.org/src/contrib/Descriptions/mvtnorm.html

For the normal:

dmvnorm gives the density
rmvnorm generates random deviates
pmvnorm computes the distribution function

and more.

Mike



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