[Scilab-users] {EXT} Re: Multiple regression on semi-log plot

[Dang Ngoc Chan, Christophe]

Hello,

> De : users <users-bounces at lists.scilab.org> De la part de Stéphane Mottelet
> Envoyé : lundi 16 novembre 2020 09:56
>
> It is possible to fit a more general piecewise-affine model,
> but you will have to know in advance the number of "kinks"

Well, I think it is possible to automatically adjust the number of segments:

1. Perform the regression with only n = 1 line segment.

2. Increase the number of segments by 1, n = n + 1.
Perform a new regression.
You can detect the furthest point to know where to separate the segments.

3. Compare the quadratic errors between the current and the preceding regression.
If the difference is small enough then end
else go back to 2.

Regards

--
Christophe Dang Ngoc Chan
Mechanical calculation engineer

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