# st: RE: RE: RE: RE: non linear regression

 From "Rune Logstein" To Subject st: RE: RE: RE: RE: non linear regression Date Thu, 24 Feb 2005 15:55:22 +0100

```How do I write a driver program?

If I go to the non linear regression menu I find a option that is called
- user supplied function. Is this a way of defining specific non linear
functions?

Rune

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: 24. februar 2005 14:07
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: RE: RE: non linear regression

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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```