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st: treatment of missing values in a matrix dissimilarity score


From   "Elkins, Zachary S" <zelkins@austin.utexas.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: treatment of missing values in a matrix dissimilarity score
Date   Mon, 15 Sep 2008 14:05:44 -0500

I'd like to calculate the matches between observations across a set of binary variables.  I suspect that there are multiple ways to do this.  I've specified:

matrix dissimilarity m=x1 x2 x3 x4, match proportion

However, some values in x1-x4 are missing.  Based on the results, it appears that Stata treats missing values as if they were 1 and I don't see how to modify that.  I'd like to calculate to calculate similarities across only non-missing elements (the number of which will be different for each pair, of course).

Thanks for any help.

Zach Elkins


______________________________
Zachary Elkins
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Department of Government
University of Texas at Austin
1 University Station A1800
Austin, TX  78712-0119

p: (512) 232-7250
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