* E435 Nonlinear Computer Assignment 
sample 1 100
* Generating data
set ranseed=119
genr u=nor(1)
genr x=time(0)
genr x2=x**2
genr x3=x**3
genr y=100+3*x-.05*x2+.0003*X3+10*u
genr ty=100+3*x-.05*x2+.0003*X3
* Doing transformations
genr lx=log(x)
genr ly=log(y)
genr x2=x*x
genr x3=x**3
genr x4=x**4
genr x5=x**5
genr x6=x**6
genr rx=1/x
genr ry=1/y
* Doing regressions - try single and double logarithmic
* equations, polynomials up to degree six, and some other
* forms
ols y x/predict=h1
ols ly lx/predict=h2 loglog
genr hat2=exp(h2)
ols ly x/predict=h3 loglin
genr hat3=exp(h3)
ols y lx/predict=h4 linlog
ols y rx/predict=h5
ols y x x2/predict=h6
ols y x x2 x3/predict=h7
ols y x x2 x3 x4/predict=h8
ols y x x2 x3 x4 x5/predict=h9
ols y x x2 x3 x4 x5 x6/predict=h10
ols ly rx/predict=h11 loglin
genr hat11=exp(h11)
ols ry lx/predict=h12
genr hat12=1/h12