Esteemed Statalisters,

Please I use Stata 16 and need your assistance with deriving cubic turning points.

This is my model specification:

lnAero = b0 + b1lnfyb + b2lnfyb^2 + b3lnfyb^3 + b4lntrade + u

Does anyone know the Stata syntax to obtain the turning points of FYB?

Any help will be greatly appreciated.

Thanks in advance,
Ngozi