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Activity Number: 309
Type: Contributed
Date/Time: Tuesday, August 2, 2016 : 8:30 AM to 10:20 AM
Sponsor: Biometrics Section
Abstract #320257 View Presentation
Title: Shrinkage in Reduced-Rank Case-Control Regression: An Application in Non-Hodgkin's Lymphoma
Author(s): Ananda Sen* and Jaya M. Satagopan
Companies: University of Michigan and Memorial Sloan Kettering Cancer Center
Keywords: Emprirical Bayes ; Hierarchical Bayes ; Penalized regression ; Case-control study ; Non-Hodgkin's Lymphoma

Matched case-control studies are popular designs used in epidemiology for assessing the effects of exposures on binary traits. Modern investigations increasingly enjoy the ability to examine a large number of exposures in a comprehensive manner. However, risk factors often tend to be related in a non-trivial way, undermining efforts to identify true important ones using standard analytic methods. Epidemiologists often use data reduction techniques by grouping the prognostic factors using a thematic approach, with themes deriving from biological considerations. However, it is important to account for potential misspecification of the themes to avoid false positive findings. To this end, we propose shrinkage type estimators based on Bayesian penalization methods. Extensive simulation is reported that compares the Bayesian and frequentist estimates under various scenarios. The methodology is illustrated using data from a matched case-control study investigating the role of polychlorinated biphenyls in understanding the etiology of non-Hodgkin's lymphoma.

Authors who are presenting talks have a * after their name.

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