IDAX.PBETA - Cumulative beta distribution

The PBETA function returns the probability that the value of a variable that follows the beta distribution is smaller or equal to x.

Syntax

IDAX.PBETA(DOUBLE x, DOUBLE shapeOne, DOUBLE shapeTwo)

Parameter descriptions

x
Mandatory.
The value that is to be computed.
Data type: DOUBLE
shapeOne
Mandatory.
The first shape of the distribution.
Min: 0.00000000001
Data type: DOUBLE
shapeTwo
Mandatory.
The second shape of the distribution.
Min: 0.00000000001
Data type: DOUBLE

PBETA(x,a,b)=1-PBETA(1-x,b,a) for all x, and for all positive a values and positive b values.

PBETA(x,1,1) is a uniform distribution over the range [0,1], PBETA(x,1,1)=PUNIF(x,0,1)

Returned information

DOUBLE the cumulative probability distribution from minus infinity to point x.