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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
(2013-04-18)
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 ...
Flexible models for non-equidispersed count data: comparative performance of parametric models to deal with underdispersion
(2022-01-01)
Count data as response variables are commonly modeled using Poisson regression models, which require equidispersion, i.e., equal mean and variance. However, this relationship does not always occur, and the variance may be ...
The beta-binomial: A preliminary comparison of smaller samples having many replications versus larger samples having fewer replications
(2018-12-05)
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
(Wiley-Blackwell, 2018-05-01)
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 ...
Ecological versatility and the assembly of multiple competitors: cautionary notes for assembly inferences
(2018-05-01)
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 ...
Multivariate models for correlated count data
(Taylor & Francis LtdAbingdonInglaterra, 2013)
Weibull and generalised exponential overdispersion models with an application to ozone air pollution
(TAYLOR & FRANCIS LTDABINGDON, 2012)
We consider the problem of estimating the mean and variance of the time between occurrences of an event of interest (inter-occurrences times) where some forms of dependence between two consecutive time intervals are allowed. ...