Documentation PHP

stats_cdf_beta

(PECL stats:1.0.0-1.0.2)

stats_cdf_beta — Fonction CDF pour Distribution BETA. Calcule n'importe quel paramètre de distribution beta des valeurs données pour les autres.

Description

float stats_cdf_beta ( float $par1 , float $par2 , float $par3 , int $which )

                              Method

     Cumulative distribution function  (P)  is calculated directly by
     code associated with the following reference.

     DiDinato, A. R. and Morris,  A.   H.  Algorithm 708: Significant
     Digit Computation of the Incomplete  Beta  Function Ratios.  ACM
     Trans. Math.  Softw. 18 (1993), 360-373.

     Computation of other parameters involve a seach for a value that
     produces  the desired  value  of P.   The search relies  on  the
     monotinicity of P with the other parameter.

                              Note

     The beta density is proportional to
               t^(A-1) * (1-t)^(B-1)

                              Arguments


     P -- The integral from 0 to X of the chi-square
            distribution.
            Input range: [0, 1].

     Q -- 1-P.
            Input range: [0, 1].
            P + Q = 1.0.

     X -- Upper limit of integration of beta density.
            Input range: [0,1].
            Search range: [0,1]

     Y -- 1-X.
            Input range: [0,1].
            Search range: [0,1]
            X + Y = 1.0.

     A -- The first parameter of the beta density.
            Input range: (0, +infinity).
            Search range: [1D-100,1D100]

     B -- The second parameter of the beta density.
            Input range: (0, +infinity).
            Search range: [1D-100,1D100]

     STATUS  -- 0 if calculation completed correctly
               -I if input parameter number I is out of range
                1 if answer appears to be lower than lowest
                  search bound
                2 if answer appears to be higher than greatest
                  search bound
                3 if P + Q .ne. 1
                4 if X + Y .ne. 1

     BOUND  -- Undefined if STATUS is 0

               Bound exceeded by parameter number I if STATUS
               is negative.

               Lower search bound if STATUS is 1.

               Upper search bound if STATUS is 2.
	

Liste de paramètres

par1

par2

par3

which

      Integer indicating which of the next four argument
               values is to be calculated from the others.
               Legal range: 1..4
               iwhich = 1 : Calculate P and Q from X,Y,A and B
               iwhich = 2 : Calculate X and Y from P,Q,A and B
               iwhich = 3 : Calculate A from P,Q,X,Y and B
               iwhich = 4 : Calculate B from P,Q,X,Y and A

       

Valeurs de retour

     STATUS  -- 0 if calculation completed correctly
               -I if input parameter number I is out of range
                1 if answer appears to be lower than lowest
                  search bound
                2 if answer appears to be higher than greatest
                  search bound
                3 if P + Q .ne. 1
                4 if X + Y .ne. 1
  	



Ceci n'est pas la documentation originale du langage de programmation php, pour y accéder visiter le site www.php.net

Support du web, outils, services, compteurs, scripts, générateurs et autres outils pour les webmasters gratuitement à 100%
Page générée en 0.002547 secondes.