Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/33969 
Year of Publication: 
2007
Series/Report no.: 
IZA Discussion Papers No. 2542
Publisher: 
Institute for the Study of Labor (IZA), Bonn
Abstract: 
Matching has become a popular approach to estimate average treatment effects. It is based on the conditional independence or unconfoundedness assumption. Checking the sensitivity of the estimated results with respect to deviations from this identifying assumption has become an increasingly important topic in the applied evaluation literature. If there are unobserved variables which affect assignment into treatment and the outcome variable simultaneously, a hidden bias might arise to which matching estimators are not robust. We address this problem with the bounding approach proposed by Rosenbaum (2002), where mhbounds allows the researcher to determine how strongly an unmeasured variable must influence the selection process in order to undermine the implications of the matching analysis.
Persistent Identifier of the first edition: 
Document Type: 
Working Paper

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