*
* Example 14.2, page 571
* Non-linear least squares
*
cal 1955
open data table14-3.prn
data(format=prn,org=columns) 1955:1 1974:1
*
nonlin b1 b2 b3
*
* The default initial guesses are 0.0. That won't work well here, since b1=0
* wipes out the other two terms.
*
compute b1=1.0,b2=b3=0.5
frml cd = b1*labor**b2*capital**b3
nlls(frml=cd) gdp