Hello,
I am comparing a linear, quadratic and cubic regression results of a Panel dataset.
Those are my commands used in stata:

- xtreg WFprod GDPpc POPden FREE STRESS AGRIland, fe
- xtreg WFprod GDPpc GDPpcq POPden FREE STRESS AGRIland, fe
- xtreg WFprod GDPpc GDPpcq GDPpcC POPden FREE STRESS AGRIland, fe

Now, I would like to see on different scatter plots with x=GDPpc and Y=WFprod how does it fit my regression curve (linear, quadratic and then cubic),
and if it possible, to see the quadratic and cubic turning points.
Can somebody help me with the code, please?
Thanks