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non linear regression
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Posted By:   du_pac
Posted On:   Friday, May 11, 2007 05:40 AM

hello all,

I am looking for a non linear regression algorithm to find soem constants for my function

F(CS)=Exp^(a*x+b)+Exp^(c*x+d)


Could some body provide soem informations.

Regards
Pac

Re: non linear regression

Posted By:   Robert_Lybarger  
Posted On:   Friday, May 11, 2007 10:09 PM

I was looking in one of my old texts about this sort of thing. Seems like exponentials are generally linearized (when possible) by working in log-space and re-expressing the equation of interest. This [sometimes] permits treating the question in a linear fashion: ln(F) = ln(exp^(a*x+b) + exp^(c*x+d)) ... but I didn't get far beyond blinking at that intial step and putting the book away. (Haven't had to use calculus since leaving grad school over ten years ago, so my brain doesn't remember the rules on expanding log expressions to go any further.) That probably isn't the kind of information you are wanting, though.
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