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Modelling Overdispersion for Complex Survey Data
International Statistical Review, 2001SummaryThe population characteristics observed by selecting a complex sample from a finite identified population are the result of at least two processes: the process which generates the values attached to the units in the finite population, and the process of selecting the sample of units from the population.
Molina, E.A. +2 more
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Overdispersion Tests in Count-Data Analysis
Psychological Reports, 2008Count data are commonly assumed to have a Poisson distribution, especially when there is no diagnostic procedure for checking this assumption. However, count data rarely fit the restrictive assumptions of the Poisson distribution. The violation of much of such assumptions commonly results in overdispersion, which invalidates the Poisson distribution ...
Jaume, Vives +3 more
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Overdispersion in nuclear statistics
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1999Abstract The modern statistical distribution theory is applied to the development of the overdispersion theory in ionizing-radiation statistics for the first time. The physical nuclear system is treated as a sequence of binomial processes, each depending on a characteristic probability, such as probability of decay, detection, etc.
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Likelihood Analyses of Overdispersed Poisson Models
Biometrics, 1997Summary: An over-dispersed set of counts of sowbugs from 1946 has been used to illustrate Bayesian methods of fitting, but it is shown that with the priors used the results differ little from those for maximum likelihood.
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Overdispersion and cluster models
1995Abstract As we have seen in previous chapters of this part, count data arise from the enumeration of events on individual units. If no explanatory variables, or time, distinguish among the events, they may be aggregated as counts. In fact, this can only be done legitimately for Poisson or binomial data if the events are independent.
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Overdispersed Molecular Evolution in Constant Environments
Journal of Theoretical Biology, 1993According to recent data analysis of DNA sequences, the dispersion index, defined as the variance-to-mean ratio of the number of base substitutions in a lineage, is often much larger than unity, which is in conflict with simple Poisson processes assumed in the molecular clock hypothesis.
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Overdispersion in poisson regression
2008Investigation of a possible relationship between air quality and human health in the community of Prince George, British Columbia was undertaken after a public opinion poll in 1972 discovered that poor air quality was the number one concern of the residents of Prince George.
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