We also see that the closeness of residual variance to the mean improves when we only look at the ‘non-elective’ births, while for the acute caesareans only there is a clear trend that the variance is larger than the mean, so-called overdispersion, which violates the assumption of Poisson distribution.
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A model for the distribution of daily number of births in obstetric clinics based on a descriptive retrospective study.
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