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Negative binomial regressionSyntaxMenuDescriptionOptions for nbregOptions for gnbregRemarks and examplesStored resultsMethods and formulasReferencesAlso seeSyntaxNegative binomial regression modelnbregdepvar[indepvars] [if] [in] [weight] [,nbregoptions]Generalized negative binomial modelgnbregdepvar[indepvars] [if] [in] [weight] [,gnbregoptions]nbregoptionsDescriptionM odelnoconstantsuppress constant termdispersion(mean)parameterization of dispersion; the defaultdispersion(constant)constant dispersion for all observationsexposure(varnamee)include ln(varnamee) in model with coefficient constrained to 1offset(varnameo)includevarnameoin model with coefficient constrained to 1constraints(constraints)apply specified linear constraintscollinearkeep collinear variablesSE/Robustvce(vcetype)vcetypemay beoim,robust,clus
nbreg— Negative binomial regression 5 Introduction to negative binomial regression Negative binomial regression models the number of occurrences (counts) of an event when the event has extra-Poisson variation, that is, when it has overdispersion. The Poisson regression model is y j˘Poisson( j) where j= exp(x j + offset j) for observed counts y
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