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Re: non linear fit

From: Henry F. Mollet
Subject: Re: non linear fit
Date: Thu, 16 Jan 2003 18:11:58 -0800
User-agent: Microsoft-Entourage/

The gnuplot manual (3 Dec. 1998, p. 19 ff) has a statistical overview on
non-linear-least-squares and gives practical guidelines. You have to
A) define your fitting function f(x,y), then
B) fit(x,y) 'datafile' .......
The fitting procedure must use least squares by default and it is probably a
y-on-x non-linear-least square fit. I don't know how you could specify your
own "loss-function", e.g. if you wanted to use max. likelihood instead of
least squares or if you wanted to use a geometrical mean (GM) regression
(would be called for if you have about equal measurement error for both x
and y data points).

on 1/16/03 7:24 AM, Paolo Ariano at address@hidden wrote:

> hi *,
> at the moment i'm using octave to analyze my data and gnuplot to make
> fit, it is possible also to make non linear fit with octave ?
> thanks a lot
> paolo

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