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Subject: Re: [office-comment] Re: sigmoid curve fitting in trend lines
- From: robert_weir@us.ibm.com
- To: Patrick Durusau <patrick@durusau.net>
- Date: Thu, 25 Oct 2012 17:57:36 -0400
I'm not sure we want to specify the method
used to fit the curve. We should probably specify the outcome.
The specific algorithm used might vary according to the processor, number
of processors, etc.
I'm sure Andreas would have some ideas,
but I wonder if we could say something like, "Uses an implementation-defined
method to fit a sigmoid curve to the data while minimizing the average
squared deviation". Then we're specifying the outcome, but allowing
fo innovation in the method.
-Rob
Patrick Durusau <patrick@durusau.net> wrote
on 10/25/2012 05:26:46 PM:
> From: Patrick Durusau <patrick@durusau.net>
> To: James Salsman <jsalsman@gmail.com>,
> Cc: office-comment@lists.oasis-open.org
> Date: 10/25/2012 05:26 PM
> Subject: Re: [office-comment] Re: sigmoid curve
fitting in trend lines
>
> James,
>
> First, thanks for the references!
>
> Second, standards can refer to other standards but generally not to
> periodical literature as normative.
>
> Which means we will have to extract the necessary definitions and
> incorporate them in the text.
>
> I will grab copies of them in the next day or so to see what that
will take.
>
> Hope you are having a great week!
>
> Patrick
>
> On 10/24/2012 09:43 PM, James Salsman wrote:
> > Patrick,
> >
> > Thank you for your question.
> >
> > First, please change "Gompertz sigmoid – Regression with
a
> > logistic...." to "Gompertz sigmoid – Regression with
a Gompertz...."
> > on the fifth line of my original request below. I'm sorry
about that
> > typo, and I tried to fix it, but it apparently didn't get fixed
in my
> > request.
> >
> > As for the methods of calculating the parameters for fitting
those two
> > very important curves, instead of trying to describe them, could
you
> > please reference these authoritative descriptions of the algorithms
> > instead?
> >
> > For logistic curve fitting: J. A. Nelder (March 1961) "The
Fitting of
> > a Generalization of the Logistic Curve" _Biometrics_ vol.
17, no. 1,
> > pp. 89-110: http://www.jstor.org/stable/2527498
> >
> > For Gompertz curve fitting: Karl W. Kaufmann (1981) "Fitting
and using
> > growth curves" _Oecologia_ vol. 49, no. 3, pp. 293-299:
> > http://www.springerlink.com/content/w153v81q72400q62
> >
> > Please let me know if I can help any further.
> >
> > Best regards,
> > James Salsman
> >
> >
> > On Wed, Oct 24, 2012 at 3:28 PM, Patrick Durusau
> <patrick@durusau.net> wrote:
> >> James,
> >>
> >> With regard to your request for the addition of:
> >>
> >>> "* logistic sigmoid – Regression with a logistic
sigmoid function –
> >>> approximate the values of the series using the model:
y =
> >>> A+B/(1+e^(-(x-C)/D))
> >>>
> >>> "* Gompertz sigmoid – Regression with a logistic
sigmoid function –
> >>> approximate the values of the series using the model:
y =
> >>> A+B·e^(C·e^(D·x))"
> >>
> >> To the ODF standard.
> >>
> >> Can you define the method for calculating the parameters
of these two
> >> functions?
> >>
> >> Please pardon our delay in reaching your request.
> >>
> >> The TC has not made a decision about your request but having
the additional
> >> information will make that task easier.
> >>
> >> Thanks!
> >>
> >> Hope you are having a great week!
> >>
> >> Patrick
> >>
> >> --
> >> Patrick Durusau
> >> patrick@durusau.net
> >> Former Chair, V1 - US TAG to JTC 1/SC 34
> >> Convener, JTC 1/SC 34/WG 3 (Topic Maps)
> >> Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC
26300
> >> Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)
> >>
> >> Another Word For It (blog): http://tm.durusau.net
> >> Homepage: http://www.durusau.net
> >> Twitter: patrickDurusau
> >>
>
> --
> Patrick Durusau
> patrick@durusau.net
> Former Chair, V1 - US TAG to JTC 1/SC 34
> Convener, JTC 1/SC 34/WG 3 (Topic Maps)
> Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
> Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)
>
> Another Word For It (blog): http://tm.durusau.net
> Homepage: http://www.durusau.net
> Twitter: patrickDurusau
>
>
> --
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