[Scilab-users] Polynomic regression

[Dang, Christophe]

Hello, 

I'm afaraid I don't understand very well your problem.

> De : Amalia Susana
> Envoyé : dimanche 29 juin 2014 05:13
>
> need some help in calculate a regression analysis between the coefficient of asimmetry 
> and the shape parameter.
> [...] The equation is:
> function y=f(x); y=[...]

You give us a function, not an equation.

> and I want to get a polynomic with x as the dependent variable of y (x is shape 
> parameter and y is the coefficient of assimettry).

You have a collection of values, and you expect them to match a parametric model.
The regression is a way to adjust the parameters of the model.

>From what I understand, you have a collection of (x, y) values, and want to find a polynomial relationship
x = p(y)
is it right?
A kind of inverse form of the f function?

> if x < 0 and (1.14 < y<10) one polynomic expression if x > 0 and (-2< y < 1.14) another 
> polynomic expression if x < 0 and (-10 < y < 0) another 

-- 
Christophe Dang Ngoc Chan
Mechanical calculation engineer

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