Table 3 Measure of over-dispersion between Poisson and negative binomial distribution.

From: Negative binomial mixed models for analyzing longitudinal CD4 count data

Fit Statistics for Conditional Distribution

Poisson

NB

− 2 log L(CD4 counts/r. effects)

199,670.3

85,320.39

Pearson \(\chi^{2}\)

145,017.0

6396.89

Pearson \(\chi^{2}\)/DF

20.66

0.91

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