Dirk Enzmann's Statistical Software
http://www.ottersbek.de/software/
Some useful programs and SPSS macros such as CovMat.sps (for writing a covariance matrix of a set of variables, r_bis for computing a biserial correlation coefficient and its sig., r_tetra.sps to compute a tetrachoric correlation coefficient and its sig.
Link added: April 17, 2002
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