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Beta I Function
Math Engineering Class

Public Function BetaI( _
      ByVal vA As Variant _
    , ByVal vP As Variant _
    , ByVal vQ As Variant _
    ) As Variant

Calculate the incomplete Beta function.

Examples: 
    BetaI(0.0, 2, 3) = 0
    BetaI(0.1, 2, 3) = 0.0523
    BetaI(0.5, 2, 3) = 0.6875
    BetaI(0.9, 2, 3) = 0.9963
    BetaI(1.0, 2, 3) = 1
See also: 
    Beta Function
    BetaLn Function
    BetaCDF Function
    BetaInverse Function
    BetaPDF Function
    MathProbability Class
    DBETAI Function
vA: Upper limit of integration. Function returns Null if vA is not between 0 and 1 inclusive, is Null, or cannot be fixed up to a Double precision floating point number.
vP: First beta distribution parameter. Function returns Null if vP is less than or equal to zero (<=0), is Null, or cannot be fixed up to a Double precision floating point number.
vQ: Second beta distribution parameter. Function returns Null if vQ is less than or equal to zero (<=0), is Null, or cannot be fixed up to a Double precision floating point number.

BetaI calculates the Double precision incomplete beta function.
The incomplete beta function ratio is the probability that a random variable from a beta distribution having parameters P and Q will be less than or equal to A.

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