*
* Example from section 7.1.2 starting page 169
*
open data cps_small.dat
data(format=free,org=columns) 1 1000 wage educ exper female black white midwest south west
*
set expersq = exper**2
*
linreg wage
# constant educ exper expersq
*
disp "Marginal Effect of Experience at 18 years" %beta(3)+2*%beta(4)*18.0
disp "Maximizing Experience" -%beta(3)/(2*%beta(4))