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Re: Calculate R-squared value from gnuplot 'fit' output?

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From	ab <ab.3942@googlemail.com>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: Calculate R-squared value from gnuplot 'fit' output?
Date	Mon, 2 Jan 2012 00:37:56 -0800 (PST)
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>
> Why does that take 3 iterations? That is just a linear LS problem?
> Linear LS regression has an analytical solution, i.e. with normal
> equations.
> Solution should be either intelligent starting values or one iteration
> from

Hi,

You can force the fit  to converge in one iteration by using
FIT_START_LAMBDA=1.e-15
FIT_MAXITER=1
This is only suited for a linear model.

A better way is the stats command in gnuplot 4.5.
The correlation coefficient  r is calculated directly.

Thread

Calculate R-squared value from gnuplot 'fit' output? Mike <mesimms@gmail.com> - 2011-12-28 12:14 -0800
  Re: Calculate R-squared value from gnuplot 'fit' output? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-12-28 22:11 +0100
  Re: Calculate R-squared value from gnuplot 'fit' output? wolfgang <cmat.wolfgang@gmail.com> - 2011-12-29 00:17 -0800
    Re: Calculate R-squared value from gnuplot 'fit' output? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-12-29 12:39 +0100
    Re: Calculate R-squared value from gnuplot 'fit' output? ab <ab.3942@googlemail.com> - 2012-01-02 00:37 -0800
  Re: Calculate R-squared value from gnuplot 'fit' output? benjamin.chen@aztopia.com - 2013-11-04 19:17 -0800
    Re: Calculate R-squared value from gnuplot 'fit' output? Karl <mail.kfr@gmx.net> - 2013-11-05 14:14 +0100
      Re: Calculate R-squared value from gnuplot 'fit' output? ooe@st-andrews.ac.uk - 2014-12-10 16:09 -0800
        Re: Calculate R-squared value from gnuplot 'fit' output? ali.a.abedi@gmail.com - 2015-01-26 11:32 -0800
          Re: Calculate R-squared value from gnuplot 'fit' output? thiagopaes@gmail.com - 2016-07-08 12:58 -0700
            Re: Calculate R-squared value from gnuplot 'fit' output? luis.blacutt@gmail.com - 2016-07-15 08:29 -0700
              Re: Calculate R-squared value from gnuplot 'fit' output? armin@armbrusters.name - 2017-02-21 12:40 -0800
  Re: Calculate R-squared value from gnuplot 'fit' output? henryxparker@gmail.com - 2017-10-13 10:25 -0700
    Re: Calculate R-squared value from gnuplot 'fit' output? Karl Ratzsch <mail.kfr@gmx.net> - 2017-10-13 19:53 +0200
      Re: Calculate R-squared value from gnuplot 'fit' output? ruben safir <ruben@mrbrklyn.com> - 2017-10-24 17:35 -0400
        Re: Calculate R-squared value from gnuplot 'fit' output? Karl Ratzsch <mail.kfr@gmx.net> - 2017-10-25 09:27 +0200

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