Hello everyone,
I am aware that this is more of a statistical quuestino than a question on Stata but maybe someone here can help me regardless:

In a poisson regression model, does it always make sense to include "fe" as well as vce(robust)? If i add "fe" to my regression, the model all of a sudden lacks degrees of freedom, if i further add vce(robust), the values become nonsignificant. Does this tell me i have created a weak model that needs to be changed? Or does it not make sence in certain cases, to add "fe" and "vce(robust)"?

Best regards

Chris