JSM 2011 Online Program

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Abstract Details

Activity Number: 229
Type: Topic Contributed
Date/Time: Monday, August 1, 2011 : 2:00 PM to 3:50 PM
Sponsor: Section on Bayesian Statistical Science
Abstract - #301851
Title: Modeling Doubly Nested Multivariate Longitudinal Count Data in HIV Sexual Behavior Intervention Studies
Author(s): Yuda Zhu*+
Companies: University of California at Los Angeles
Address: 3770 Keystone Ave, Los Angeles, CA, 90034,
Keywords: HIV Prevention ; MCMC ; Hierarchical Nested ; Behavior ; Multivariate Count Data
Abstract:

We present a multivariate nested count model to model the sexual behaviors of participants in an HIV behavioral intervention trial. The model we present is motivated by data collected from the Health Living Project (HLP) to evaluate the effects of a randomized counseling intervention. Standard models in the field typically model a single composite outcome longitudinally over time. We make the case for the inclusion of a multivariate nested outcome model. Outcomes are deaggregated on a partner specific level resulting in a 2 level nested structure. Nested within participant are the number of protected and unprotected sex acts with each individual partner. At the participant level, outcomes include the number of HIV positive and HIV negative partners. A corresponding 2 level correlation structure is used to model correlation between outcomes.


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