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The matching method for treatment evaluation with selective participation and ineligibles

Authors: Monica Costa Dias , Hidehiko Ichimura and Gerard Van Den Berg
Date: 30 December 2007
Type: cemmap Working Paper, CWP33/07
DOI: 10.1920/wp.cem.2007.3307

Abstract

The matching method for treatment evaluation does not balance selective unobserved differences between treated and non-treated. We derive a simple correction term if there is an instrument that shifts the treatment probability to zero in specific cases. Policies with eligibility restrictions,where treatment is impossible if some variable exceeds a certain value, provide a natural application. In an empirical analysis, we first examine the performance of matching versus regression-discontinuity estimation in the sharp age-discontinuity design of the NDYP job search assistance program for young unemployed in the UK. Next, we exploit the age eligibility restriction in the Swedish Youth Practice subsidized work program for young unemployed, where compliance is imperfect among the young. Adjusting the matching estimator for selectivity changes the results towards ineffectiveness of subsidized work in moving individuals into employment.

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Monica Costa Dias, Hidehiko Ichimura and Gerard Van Den Berg November 2010, The matching method for treatment evaluation with selective participation and ineligibles, cemmap Working Paper, CWP35/10

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