matching
http://blogs.worldbank.org/impactevaluations/taxonomy/term/4105/all
enIntroducing 'Ask Guido'
http://blogs.worldbank.org/impactevaluations/introducing-ask-guido
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><em>This week we're introducing our new series that we decided to call 'Ask Guido.' Guido Imbens has kindly agreed to answer technical questions every so often and we are thrilled. For this first installment, Guido starts by answering a question about standard errors and the appropriate level of clustering in matching.</em><br />
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One question that often comes up in empirical work concerns the appropriate way to calculate standard errors, and in particular the correct level of clustering. Here is a specific version of the question that someone posed, slightly paraphrased:</p></div></div></div>Thu, 20 Feb 2014 04:47:00 +0000Berk Ozler1086 at http://blogs.worldbank.org/impactevaluationsTools of the trade: recent tests of matching estimators through the evaluation of job-training programs
http://blogs.worldbank.org/impactevaluations/tools-trade-recent-tests-matching-estimators-through-evaluation-job-training-programs
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even">Of all the impact evaluation methods, the one that consistently (and justifiably) comes last in the methods courses we teach is <em>matching</em>. We de-emphasize this method because it requires the strongest assumptions to yield a valid estimate of causal impact. Most importantly this concerns the assumption of <em>unconfoundedness</em>, namely that selection into treatment can be accurately captured solely as a function of observable covariates in the data.</div></div></div>Wed, 05 Jun 2013 13:44:00 +0000Jed Friedman997 at http://blogs.worldbank.org/impactevaluationsPower Calculations for Propensity Score Matching?
http://blogs.worldbank.org/impactevaluations/power-calculations-for-propensity-score-matching
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span style="FONT-SIZE: 10pt">I received a question this week from </span><a href="http://go.worldbank.org/HCN92KM2G0"><span style="FONT-SIZE: 10pt"><font color="#0000ff">Kristen Himelein</font></span></a><span style="FONT-SIZE: 10pt">, a bank colleague who is working on an impact evaluation that will use propensity score matching.</span></p></div></div></div>Mon, 21 Nov 2011 01:52:08 +0000David McKenzie693 at http://blogs.worldbank.org/impactevaluations