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Results tagged with overdispersion
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user 29087
Overdispersion is when there is greater variability than there 'ought' to be in the data. Eg, the variance of counts is often greater than the mean, whereas the variance of a Poisson should equal the mean.
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Very large theta values using glm.nb in R - alternative approaches?
It doesn't necessarily mean that there is overdispersion (though it could), just that a saturated model may be a better fit. … Thinking about overdispersion in a count model is always a good idea, but it does introduce complexity into the model. …
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