* E435 computer assignment # 7 - first part
set nocolor
file 11 b:data7-12.dat
read(11) price hatch wbase length width height &
weight cyl litres gasmpg trans
ols price weight cyl litres/resid=r
diagnos/het
* Instruction 2
genr pdbw=price/weight
genr cdbw=cyl/weight
genr ldbw=litres/weight
genr rw=1/weight
* Note the intercept is the coefficient of WEIGHT
* and the coefficient of rw is the intercept
ols pdbw cdbw ldbw rw
diagnos/het
* Instruction 3
genr lr2=log(r**2)
genr lweight=log(weight)
ols lr2 lweight
pause
* Slope coefficient in previous = 7
genr pdbw3=price/(weight**3.5)
genr cdbw3=cyl/(weight**3.5)
genr ldbw3=litres/(weight**3.5)
genr wdbw3=weight/(weight**3.5)
genr rw3=1/(weight**3.5)
ols pdbw3 cdbw3 ldbw3 wdbw3 rw3/noconstant
* Doing above with the WEIGHT= option
genr wt=1/(weight**7)
ols price weight cyl litres/weight=wt