Re: [office-comment] Re: sigmoid curve fitting in trend lines

[Patrick Durusau <patrick@durusau.net>]

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