An EM Algorithm for Mixed-Type Multiple Outcome Regressions With Applications to a Prostate Cancer Study

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dc.contributor.advisorSmith, Paul J.en_US
dc.contributor.authorRudd, JoAnn M.en_US
dc.contributor.departmentMathematical Statisticsen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2008-10-11T05:43:18Z
dc.date.available2008-10-11T05:43:18Z
dc.date.issued2008-06-05en_US
dc.description.abstractWe propose a joint model for binary and continuous responses using a latent variable for the binary response. The observed continuous response and the latent response are treated as correlated normals obeying a bivariate regression model. We develop an EM algorithm to find maximum likelihood estimates for the parameters. We perform the E-step analytically and use an iterative algorithm for the M-step. The algorithm is applied to a prostate cancer clinical trial whose goal was to assess therapeutic effects of diethylstilbestrol (DES) in advanced cancer patients and to assess possible excess cardiovascular mortality. Therapeutic effects were measured as prostatic acid phosphatase (PAP) levels follow-up and whether the patient progressed to stage IV or died of cancer. The treatment reduced PAP levels but not the incidence of cancer mortality within a six-month time frame. Higher doses of DES were associated with increased risk of cardiovascular-related death.en_US
dc.format.extent224528 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/8511
dc.language.isoen_US
dc.subject.pqcontrolledStatisticsen_US
dc.subject.pqcontrolledBiology, Biostatisticsen_US
dc.subject.pqcontrolledStatisticsen_US
dc.subject.pquncontrolledprostate canceren_US
dc.subject.pquncontrolledEMen_US
dc.subject.pquncontrolledmultiple outcomesen_US
dc.subject.pquncontrolledmixed typeen_US
dc.titleAn EM Algorithm for Mixed-Type Multiple Outcome Regressions With Applications to a Prostate Cancer Studyen_US
dc.typeThesisen_US

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