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dc.contributor.author Chen, Xiaohong en_US
dc.contributor.author Hong, Han en_US
dc.contributor.author Tarozzi, Alessandro en_US
dc.date.accessioned 2010-06-28T18:50:31Z
dc.date.available 2010-06-28T18:50:31Z
dc.date.issued 2007 en_US
dc.identifier.uri http://hdl.handle.net/10161/2569
dc.description.abstract We study semiparametric efficiency bounds and efficient estimation of parameters defined through general moment restrictions with missing data. Identification relies on auxiliary data containing information about the distribution of the missing variables conditional on proxy variables that are observed in both the primary and the auxiliary database, when such distribution is common to the two data sets. The auxiliary sample can be independent of the primary sample, or can be a subset of it. For both cases, we derive bounds when the probability of missing data given the proxy variables is unknown, or known, or belongs to a correctly specified parametric family. We find that the conditional probability is not ancillary when the two samples are independent. For all cases, we discuss efficient semiparametric estimators. An estimator based on a conditional expectation projection is shown to require milder regularity conditions than one based on inverse probability weighting. en_US
dc.format.extent 412242 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.publisher Annals of Statistics en_US
dc.subject Auxiliary data en_US
dc.subject GMM models en_US
dc.subject Semiparametric efficiency en_US
dc.title Semiparametric Efficiency in GMM Models with Auxiliary Data en_US
dc.type Journal Article en_US
dc.department Economics

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