[Scilab-users] Problems with cdfbet

[Dang Ngoc Chan, Christophe]

Hello Heinz,

> De : users <users-bounces at lists.scilab.org> De la part de Heinz Nabielek
> Envoyé : mardi 1 novembre 2022 22:02
>
> I need to compute the inverse of the cumulative beta function, but I just cannot handle cdfbet.

>From what I undestand in
https://help.scilab.org/docs/6.1.1/en_US/cdfbet.html
the notation for the beta function in Scilab is :

P = \int_{0}^{X} t^{A-1} * (1-t)^{B-1} dt

What you want is X knowing [P, A, B] right ?

The syntax seems to be

[X,Y]=cdfbet("XY",A,B,P,Q)

With Q = 1 - P.

With your examples:

--> [X,Y]=cdfbet("XY",1 ,10 ,0.95 ,0.05)
 X  =

   0.2588656
 Y  =

   0.7411344

--> [X,Y]=cdfbet("XY",1 ,100 ,0.95 ,0.05)
 X  =

   0.0295130
 Y  =

   0.9704870

Regards

--
Christophe Dang Ngoc Chan
Mechanical calculation engineer
Technology & Open Innovation
Product Management & Development

Sidel Group
Sidel Blowing & Services
Avenue de la Patrouille de France
CS 60627, Octeville-sur-Mer
76059 Le Havre cedex, France


Tel: 33(0)2 32 85 89 32
Fax: 33(0)2 32 85 91 17

<http://www.sidel.com/>
<mailto:christophe.dang at sidel.com>





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