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Seminário do
Grupo de Inferência Bayesiana (GIB)
30/05/2008-14
horas
Sala de seminários do Departamento de Estatística- UFSCar-São Carlos-SP
Titulo: A hierarchical zero-inflated Poisson model with correlated parameters
Abstract Lambert
(1992, Technometrics
34, 1
-14)
described the zero-inflated Poisson (ZIP) regression,
a class of models for count data with an excess of zeros. This model is
extended to accommodate correlated genetic effects in the regression structure
of the Poisson and mixture parameters. In addition, an intercorrelation
structure between these genetic random effects is introduced, and used to infer
pleiotropy, an _expression_ of the extent to which the mixture and Poisson
parameters are infuenced by common genes. The methods described here are implemented and illustrated with data from
number of mastitis cases in Norwegian Red cows. Bayesian analysis yields
posterior distributions useful for studying environmental and genetic
variability, as well as genetic correlation. The model is assessed using
posterior predictive checks.
Estão todos convidados, abraços Josemar |