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st: margins at every observation

From   Thomas <>
Subject   st: margins at every observation
Date   Tue, 12 Oct 2010 14:49:08 +0100

I want to calculate the marginal effects for all observations:

sysuse auto, clear
reg price c.mpg##c.mpg

gen dydx = _b[mpg]+2*_b[ c.mpg#c.mpg]*mpg

I thought I would get the same using:

margins, dydx(mpg) at((asobserved) mpg)

but I only get a single value at the mean of mpg.

How can I get the marginal effect at each observation from -margins- (if at all)?


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