*
* Example BIGDREG.DAT from pp 192-195
*
open data bigdreg.dat
calendar(q) 1995
data(format=free,org=columns) 1995:1 1998:4 demand trend q2 q3 q4
*
* Linear effects
*
linreg demand
# constant trend q2 q3 q4
*
* Multiplicative effects
*
set logd = log(demand)
linreg logd
# constant trend q2 q3 q4
prj logfit
set fit = exp(logfit)
set error = demand-fit
*
@uforeerrors demand fit