st: mahapick; package to pick matched control cases --again

[David Kantor <kantor.d@att.net>]

Hi all,

A few weeks back I announced mahapick, but at the time, it was not 
properly installed in the SSC.

This has been fixed now.  So if anyone tried to install it then and 
failed, you should try again now.

This set of programs allows you to select matching control cases for 
a set of "treated" cases -- for subsequent analysis.  Matching is 
done with replacement, using a Mahalanobis distance measure.  There 
are also programs to compute the distance measure and manage the 
resulting dataset.  There is also a program to place a set of 
variances into a matrix (an operation that was useful within these 
programs, but may interest others as  well).

Thanks to Kit Baum, for placing it into the SSC archives.

--David Kantor

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