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Quasi-Poisson vs. Negative Binomial Regression

How Should We Model Overdispersed Count Data?

Bibliographic Data

ID23318629
AuthorsJay M Ver Hoef (0000-0003-4302-6895, NOAA National Marine Fisheries Service, corresponding author), Peter L Boveng (0000-0003-2732-4833, NOAA National Marine Fisheries Service)
Year2007
Volume88
Issue11
Pages2766-2772
Publication date2007-11-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueEcology (JOURNAL)
Journal identifiersISSN: 0012-9658 • E-ISSN: 1939-9170
PublisherWiley (PUBLISHER • GB)
DOI10.1890/07-0043.1
PMID18051645
OpenAlexW2121024352
LanguageEN
Citations received104
References cited22

Quasi-Poisson and negative binomial regression models have equal numbers of parameters, and either could be used for overdispersed count data. While they often give similar results, there can be striking differences in estimating the effects of covariates. We explain when and why such differences occur. The variance of a quasi-Poisson model is a linear function of the mean while the variance of a negative binomial model is a quadratic function of the mean. These variance relationships affect the weights in the iteratively weighted least-squares algorithm of fitting models to data. Because the variance is a function of the mean, large and small counts get weighted differently in quasi-Poisson and negative binomial regression. We provide an example using harbor seal counts from aerial surveys. These counts are affected by date, time of day, and time relative to low tide. We present results on a data set that showed a dramatic difference on estimating abundance of harbor seals when using quasi-Poisson vs. negative binomial regression. This difference is described and explained in light of the different weighting used in each regression method. A general understanding of weighting can help ecologists choose between these two methods.

Count data · Covariate · Econometrics · Generalized linear model · Negative binomial distribution · Overdispersion · Poisson distribution · Poisson regression · Population · Quasi-likelihood · Regression analysis · Statistics · Variance (accounting) · Variance function · Weighting · Zero-inflated model · Avian ecology and behavior · Marine animal studies overview · Mathematics · Water Quality and Resources Studies

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Unique citing works104
Citations per year6,12
Citation span2009 - 2026 (18)
Citation velocitycurrent
Highly citedYes
Citation typesNeutral: 98
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