*
* Example 3.2 from page 33
*
open data tablef2-1[1].txt
calendar 1940
data(format=prn,org=columns) 1940:1 1950:1 year x c w
*
* Full sample regression
*
linreg c
# constant x
*
* Skipping the war years. We need the SMPL to switch the 0-1 values in w.
*
linreg(smpl=1-w) c
# constant x
*
* Allowing for a separate intercept for the war and non-war years.
*
linreg c
# constant x w