From help-octave-request at bevo dot che dot wisc dot edu  Tue Dec 15 11:38:07 1998
Subject: Re: fit data - trendline through zero
From: ldoolitt at jlab dot org
To: Marcel at Meissel dot com (Marcel Meissel)
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Tue, 15 Dec 1998 12:38:05 -0500 (EST)

Marcel -
 
> I use polyfit to find the trendline in my data. How can I force it to go
> through zero ?

Divide your data by x before fitting.  Think about it.

On a related note, I have a hacked polyfit (polyweightfit) that
accepts weighting factors for each point.  If that sounds generally
interesting, I can post or submit it.

     - Larry Doolittle   ldoolitt at jlab dot org