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Panel Dataset Regression with xtpoisson FE Problems with vce(robust)

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Hello there,

I have a question, I am currently working on a regression within a Panel Dataset wich is set like this: xtset gvkey appyear.

The regression i want to do should be with the xtpoisson, I often heard that one has to cluster the standard errors through the notion: fe vce(robust), at the end of the regression.

My regression without the clustered SE looks like that: Array



But if I use the vce(robust) everything turns insignificant (P>z goes through the roof, Coefficient turn negative and vice versa etc.)

Do you have any tipps, do I even need the Robust function, do I need to use it differently? Help would be appreciated :D

Thank you very much!

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