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st: mahaselectunique added to mahapick

From   David Kantor <>
To   Statalist <>
Subject   st: mahaselectunique added to mahapick
Date   Thu, 15 Nov 2012 11:20:58 -0500

Hello All,

Thanks to Kit Baum, a new component, mahaselectunique, has been added to the mahapick module on SSC.

Every once-in-a-while, someone asks for this, so I have finally made it into a program for general use.

mahaselectunique enables you to take the output of mahapick (a set of "near" observations, according to a Mahalanobis distance measure) and selects unique matches based on a randomized priority. That is, mahaselectunique would typically follow the use of mahapick -- to reduce the resulting data to a unique set -- unique in that a given control observation appears only once. It is not unique in that a randomization process is used. And there is no optimization either; that's another story for another day.

Thanks go to those of you who have been requesting this; most recently this includes David Greenwood-Sanches and Paula Arce.

To install:
ssc install mahapick

(There are also some minor updates to some of the existing help files therein -- for other components.)


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