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A mixed model framework for teratology studies
Johan Braeken1, Francis Tuerlinckx
1Department of Methodology and Statistics, Tilburg University, Tilburg, the Netherlands and CITO, Arnhem, the Netherlands. j.braeken@uvt.nl
Abstract:
A mixed model framework is presented to model the characteristic multivariate binary anomaly data as provided in some teratology studies. The key features of the model are the incorporation of covariate effects, a flexible random effects distribution by means of a finite mixture, and the application of copula functions to better account for the relation structure of the anomalies. The framework is motivated by data of the Boston Anticonvulsant Teratogenesis study and offers an integrated approach to investigate substantive questions, concerning general and anomaly-specific exposure effects of covariates, interrelations between anomalies, and objective diagnostic measurement.
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