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Nov 12 at 3:51 comment added mce Thanks for your response! There were no warnings from the model. My best model is CMP with no Z-I , CMP with constant Z-I is 2nd, and this one is third, which I was surprised by. Maybe the CMP distribution is more important than Z-I for this data. I was also surprised I could get an AIC without standard errors, that was my main concern. The other concern is that the residuals of the best model indicate zero inflation and flag homogeneity of variance. Residuals are best for my 4th best model, negative binomial with no Z-I. Coefficient estimates are very similar in all the models.
Nov 12 at 1:34 history edited Ben Bolker CC BY-SA 4.0
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Nov 12 at 1:22 history answered Ben Bolker CC BY-SA 4.0