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Re: Fitting: How does gnuplot calculate the covariance matrix?

Newsgroups comp.graphics.apps.gnuplot
From Charles Allen <ca137tmp@earthlink.net>
Subject Re: Fitting: How does gnuplot calculate the covariance matrix?
References <9088euFi3iU1@mid.individual.net> <908n9pF2jaU1@mid.individual.net> <90e7s7F9faU1@mid.dfncis.de>
Message-ID <slrniq4lf3.4pm.ca137tmp@mobile.local> (permalink)
Date 2011-04-10 20:14 -0500

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> On 08.04.2011 17:18, Ingo Thies wrote:
>> Another point seems to be even more problematic, that is the usage of
>> the "asymptotic standard error".

Hans-Bernhard Bröker:
> Those errors are _way_ too big.  Do yourself a favour and plot your data 
> along with the model, using parameters modified by those errors:

Perhaps there is confusion about "standard error" (error on the mean)
versus standard deviation.  The factor of 1/sqrt(21) (or however many
data points there were) seems about right.  Gnuplot is reporting the
error on the mean, the other program may be reporting the standard
deviation.

-- 
Charles Allen

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Thread

Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-08 13:05 +0200
  Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-08 17:18 +0200
    Re: Fitting: How does gnuplot calculate the covariance matrix? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-04-10 19:31 +0200
      Re: Fitting: How does gnuplot calculate the covariance matrix? Charles Allen <ca137tmp@earthlink.net> - 2011-04-10 20:14 -0500
        Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-14 15:41 +0200
      Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-11 21:42 +0200
        Re: Fitting: How does gnuplot calculate the covariance matrix? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-04-11 23:27 +0200
          Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-12 11:28 +0200
            Re: Fitting: How does gnuplot calculate the covariance matrix? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-04-16 00:03 +0200
              Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-16 18:06 +0200
      Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-14 15:07 +0200
      Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-15 13:47 +0200
  Re: Fitting: How does gnuplot calculate the covariance matrix? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-04-10 19:04 +0200
    Re: Fitting: How does gnuplot calculate the covariance matrix? Ingo Thies <ingo.thies@gmx.de> - 2011-04-11 22:13 +0200

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