Sensitivity Analysis/Robustness checks

[Padmavathi Bandaru]

Hi,
Could please help me figure out how to do sensitivity analysis or robustness checks for this fixed effects regression.

reg tariff i.year##c.emissions i.year i.naics_4, vce(cluster naics_4)

I have dataset for 5 years for all variables per naics codes.

Thanking you
(Stata 18)

[George Ford]

fixed effects for naics_4 and year?

[Carlo Lazzaro]

Padmavathi:
why going -regress- when you can go -xtreg,fe- or the community-contributed module -reghdfe-?
As far as the robustness checks are concerned, I would repeat the -linktest- procedure by hand (as -xtreg- does not support it).