Boletim do resumo e programas (XIV EMR 2015)

XIV Escola de Modelos de Regressão
De 2 a 5 de Março de 2015 - Centro de Convenções - Unicamp
45
Comunicação Oral 6.1 ( CO6)
Randomly truncated nonlinear beta mixed-effects models
Carolina Costa Mota Paraíba
Carlos Alberto Ribeiro Diniz
Resumo: We present a class of randomly truncated nonlinear beta mixed-effects
models where the truncated nature of the data is incorporated into the statistical
model by considering the truncation limits to be random variables and by assuming
the variable of interest to follows a truncated beta distribution parametrized by a
mean and a dispersion parameter. The location parameter of the responses is
associated with a nonlinear continuous function of covariates and unknown
parameters and with unobserved random effects. Maximum likelihood estimator of
the parameters are obtained by direct maximization of the log-likelihood function
via an iterative procedure and diagnostic analysis tools are considered to check for
model adequacy. A data sets consisting of observations on soil-water retention from
a soil profiles from the Buriti Vermelho River Basin database is analyzed using the
proposed methodology.
Palavras-Chave: Truncated beta distribution, random truncation, nonlinear
mixedeffects model, iterative maximum likelihood, diagnostic analysis, soil-water
retention.
Auditório
2
Data
Março
5
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: http://www.ime.usp.br/~abe/emr2015