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Subject: sigmoid curve fitting in trend lines


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



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