**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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