Estimating multiple treatment effects in two-phase observational data

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dc.contributor.advisor Cindy Yu
dc.contributor.author Liu, Bin
dc.contributor.department Statistics
dc.date 2018-07-22T02:37:58.000
dc.date.accessioned 2020-06-30T02:50:11Z
dc.date.available 2020-06-30T02:50:11Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2013
dc.date.embargo 2015-07-30
dc.date.issued 2013-01-01
dc.description.abstract <p>We propose three estimators: Two-phase Regression (TPR), Generalized Method of Moments (GMM), and Empirical Likelihood (EL) estimators to estimate multiple treatment effects in two-phase observational data. They use semiparametric generalized propensity scores in estimating average treatment effects in the presence of informative first-phase sampling. The proposed estimators can be easily extended to any number of treatments and do not rely on a prespecified form of the treatment selection func- tions. All of the three proposed estimators have considered the first phase and second phase inclusion probabilities in their propensity scores to eliminate the biases resulted from ignoring survey sampling designs and selection bias. The proposed TPR estimator which deals with continuous response is shown to have improved efficiency compared to the double expansion estimators using sieve semiparametric regressions. The GMM and EL estimators, which estimate treatment effects defined through generalized estimating equations, reduce Monte Carlo variance by adding covariates and combing all the gen- eralized estimating equations in treatment groups. Results from simulation studies and real data studies for three estimators are presented.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/13505/
dc.identifier.articleid 4512
dc.identifier.contextkey 5050345
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/13505
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/27692
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/13505/Liu_iastate_0097E_13865.pdf|||Fri Jan 14 19:54:33 UTC 2022
dc.subject.disciplines Statistics and Probability
dc.title Estimating multiple treatment effects in two-phase observational data
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 264904d9-9e66-4169-8e11-034e537ddbca
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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