st: New package -cochran- on SSC

["Jann, Ben" <ben.jann@soz.gess.ethz.ch>]

Thanks to Kit Baum, a package -cochran- has been 
added to the SSC Archive. Type 

 . ssc describe cochran

-cochran- performs a test for equality of two or more
proportions in matched samples. The chi-squared 
calculated by -cochran- is known in the literature 
as Cochran's Q (Cochran 1950).

ben

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