Hi, I'm conducting nested negative binomial regression models and am getting a strange error at the first step with 4 independent variables ("There are no valid cases for the log link function. Only the iteration history is displayed. Execution of this command stops.") When I specified that the dispersion variable would 1, there is no problem. However, I want to have the dispersion variable freely estimated.

When I run the second step model with 6 variables, there is no problem with the model converging. The same is true for the 3rd and 4th models that have more IVs.

I have selected only participants who have complete data at the final step and I'm still getting this error.

When

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