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Results tagged with underdispersion
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user 216170
Underdispersion is when there is less variability than there 'ought' to be in the data. Eg, the variance of counts could be less than the mean, whereas the variance of a Poisson should equal the mean.
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What does the dispersion parameter mean in negative binomial regression?
If you are using glm.nb from the MASS package, the variance is $\mu+\mu^2/\theta$, so the variance is larger than $\mu$. Different packages may define the dispersion parameter differently. But, if it …
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