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    $\begingroup$ Ok, thx a lot for the quick answer! $\endgroup$ Commented Jun 28, 2020 at 14:52
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    $\begingroup$ I think there are some generalizations of the r-squared for logistic regression expressed in terms of ratios of chi-square statistics from the log likelihood. I'm not confident, but my gut says that since the poisson is in the same family, those expressions might also be of some use. $\endgroup$ Commented Jun 28, 2020 at 17:13
  • $\begingroup$ en.wikipedia.org/wiki/Logistic_regression#Pseudo-R2s $\endgroup$ Commented Jun 28, 2020 at 17:22