A Martingale Representation for Matching Estimators
Harvard University - Harvard Kennedy School (HKS); National Bureau of Economic Research (NBER)
Guido W. Imbens
University of California, Berkeley - Department of Economics; National Bureau of Economic Research (NBER); Institute for the Study of Labor (IZA)
IZA Discussion Paper No. 4073
Matching estimators are widely used in statistical data analysis. However, the distribution of matching estimators has been derived only for particular cases (Abadie and Imbens, 2006). This article establishes a martingale representation for matching estimators. This representation allows the use of martingale limit theorems to derive the asymptotic distribution of matching estimators. As an illustration of the applicability of the theory, we derive the asymptotic distribution of a matching estimator when matching is carried out without replacement, a result previously unavailable in the literature.
Number of Pages in PDF File: 14
Keywords: matching, martingales, treatment effects, hot-deck imputation
JEL Classification: C13, C14, C21working papers series
Date posted: March 30, 2009
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