Regression force fit

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Wed, 07/20/2011 - 03:06 pm

Hi all,

I know how to do a basic curve fit but I would like to force fit it through (0,0). I've been playing around with different parameters under the coefficients tab but nothing is working. Am I looking for it in the wrong place? Help is much appreciated.

Thanks,
Elaina
This is achieved by fixing the intercept of the line to zero. In the curve fitting dialog (analysis->curve fitting), go to the "Coefficients" tab, fill in an initial guess of zero for a, and check the "hold?" checkbox next to it.

July 20, 2011 at 03:14 pm - Permalink

The solution given by 741 will work if you're fitting a line, but you don't tell us what fitting function you're using. It may or may not be easy or even possible depending on the fitting function. What function are you using?

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

July 20, 2011 at 05:28 pm - Permalink

741, that was exactly what I needed because I am using a basic line fit.

Thanks for the help!

July 22, 2011 at 02:03 pm - Permalink