Now showing items 1-10 of 78
Beta-binomial/gamma-poisson regression models for repeated counts with random parameters
(Brazilian Statistical Association, 2011-07)
Beta-binomial/Poisson models have been used by many authors to model multivariate count data. Lora and Singer [Stat. Med. 27 (2008) 3366-3381] extended such models to accommodate repeated multivariate count data with ...
Phylogenetic structure of communities between temperate and tropical regions: Exploring patterns through literature datasets
Latitudinal patterns of diversity are one of the most striking large-scale biological phenomena and several hypotheses have been proposed to explain them. Using data from literature-surveys we investigated how phylogenetic ...
Beta-binomial/Poisson regression models for repeated bivariate counts
(JOHN WILEY & SONS LTD, 2008)
We analyze data obtained from a study designed to evaluate training effects on the performance of certain motor activities of Parkinson`s disease patients. Maximum likelihood methods were used to fit beta-binomial/Poisson ...
A Poisson mixed model with nonnormal random effect distribution
(ELSEVIER SCIENCE BVAMSTERDAM, 2012)
In this paper, we propose a random intercept Poisson model in which the random effect is assumed to follow a generalized log-gamma (GLG) distribution. This random effect accommodates (or captures) the overdispersion in the ...
Multivariate models for correlated count data
In this study, we deal with the problem of overdispersion beyond extra zeros for a collection of counts that can be correlated. Poisson, negative binomial, zero-inflated Poisson and zero-inflated negative binomial distributions ...
Structure of the parasites communities in two Erythrinidae fish from Amazon river system (Brazil).
(Revista Brasileira de Parasitologia Veterinária, Jaboticabal, v. 24, n. 2, p. 183-190, abr./jun. 2015., 2015)
The beta-binomial: A preliminary comparison of smaller samples having many replications versus larger samples having fewer replications
The experiment investigated whether a body of difference test data, arranged into small consumer samples with many replications, would elicit more or less overdispersion than an equal number of tests from same body of data, ...
Ecological versatility and the assembly of multiple competitors: cautionary notes for assembly inferences
The role of niche differences and competition is invoked when one finds coexisting species to be more dissimilar in trait composition than expected at random in community assembly studies. This approach has been questioned ...