QQCOMPARE: Stata module to evaluate balance after matching using quantile-quantile plots

Sunil Mitra Kumar ()
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Sunil Mitra Kumar: King's College London

Statistical Software Components from Boston College Department of Economics

Abstract: qqcompare helps evaluate balance after propensity score or Mahalanobis matching by comparing covariate balance using quantile-quantile plots. This allows for comparing the entire distribution of covariates, and not just their means, and thereby choosing the best matching algorithm among different alternatives according to which algorithm is most effective in reducing imbalance. qqcompare reports the mean and maximum deviation in quantile-quantile plots from the 45 degree line of identical distribution post-matching, and the relative (percentage) reduction that results from matching, compared to the unmatched data. Higher relative reductions indicate better balance. If the drawgraph option is specified, qqcompare draws quantile-quantile plots for each covariate, before and after matching.

Language: Stata
Requires: Stata version 9 and cquantile from SSC (q.v.)
Keywords: matching; QQ plots; quantile plots; balance (search for similar items in EconPapers)
Date: 2015-07-08
Note: This module should be installed from within Stata by typing "ssc install qqcompare". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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http://fmwww.bc.edu/repec/bocode/q/qqcompare.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/q/qqcompare.sthlp help file (text/plain)

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