st: Plotting graph for a cubic regression model

["Sebastian van Baal" <s.vanbaal@arcor.de>]

Dear Stata Users: 
 
I have a question concerning an old threat (please see below). It offers a
solution to the problem of plotting the partial effect of a predictor in a
quadratic regression model. My aim is to do the same for a cubic regression
model and the solution offered below works fine. However, since this threat
is rather old and since "adjust" seems to be out-of-use, I wonder if there
is an easier of "better" way to do it. 

Any suggestions? 

Thanks in advance 
Sebastian

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