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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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Cause of overdispersion and multilevel model [closed]

I found that, because of some overdispersion in the data, a negative binomial regression seemed better than a poisson. … I was also wondering whether it is possible to test for overdispersion in SPSS in the multilevel context. …
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