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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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residual plot that the 0.65 dispersion ratio indicates a good model fit or not I understand what I would do if I was running a Generalized Linear Model that had overdispersion issues (which seems to …
asked Jul 19 '16 by tri