st: Understanding graphs

[Claude Francoeur <claude.francoeur@hec.ca>]

Hello,

I produced a graph using the following commands :

adjust, by(x) replace

line xb x, sort

I understand that this tells Stata to use the mean of xb for each 
category of x (x = 0,1,2,3,4,5,6; n=289)to produce the graph.

I would like to replicate this graph using "predict" (to make sure that 
understand correctly). How can I tell Stata to use the mean of x? How 
should I modify the following commands :

predict yhat, xb

line yhat demo1, sort


Thank you for your help!

Claude
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