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st: could be simple but I don't get the error message on range


From   Nirina F <fstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: could be simple but I don't get the error message on range
Date   Wed, 15 Feb 2012 08:22:20 +0300

Hello,
could you please rescue me on how to run these two graphs as I get
error messages all the time on range or parentheses. May be my stata
was not up to date?
many thanks,
Nirina

sysuse auto

probit foreign mpg
mfx
#delimit ;
twoway   (function y =_b[mpg]*x+(_b[_cons])), range(mpg) xtitle(Years
of Schooling) ytitle(Marginal effect))
 ;



probit foreign mpg
mfx
sum price
local price = r(mean)

#delimit ;
twoway (function y
=_b[mpg]*normden(_b[i_age]*`price'_b[mpg]*x+_b[_cons]), range(mpg)
ytitle(Marginal effect)
xtitle(years of schooling)) ;
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