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st: RE: RE: RE: non linear regression


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: non linear regression
Date   Thu, 24 Feb 2005 13:07:06 -0000

You need to write your own driver program
for -nl-. 

-sin()- and -cos()- are built-in functions. 

Nick 
n.j.cox@durham.ac.uk 

Rune Logstein
 
> I have found the family of -nl- commands but I did not found 
> any option
> for formulating sin cos functions 

David Harrison
 
> Try the help/manual for -nl-

Rune Logstein 
 
> In my econometric project I intend to estimate a model with
> nonlinearities. The model could be:
> 
> lnC = A+a*sin(b*x)+B*cos(d*x) +k*lnE+g*lnS, 
> 
> where A, a, b, B, d, k and g are parameters to be estimated. 
> C and x, E
> and S are variables. (the meaning of the sign " * ", means d 
> multiplied
> by x).
> 
> The interesting thing with this model is the nonlinear trigonometric
> part of the model. Does anyone know how to formulate/programme such a
> nonlinear function in stata? 

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