Tuesday, July 6, 2021

How to get 95% Confidence Interval (CI) of the turning point of an inverted U-shaped curve with stata?

Dear all,

I have obtained an inverted U-shape relationship between independent variable X and dependent variable Y with GLS and robust regressions (reg, robust) and have plotted the curve and calculated the turning point.

I need to further get the turning point's 95% CI but do not know how to do this with stata.

If any one knows how to do it, please help. Thank you!

Elaine

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