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Beta CDF Excel Function
Math Probability Class

Public Function BetaCDFExcel( _
      ByVal vX As Variant _
    , ByVal vAlpha As Variant _
    , ByVal vBeta As Variant _
    , Optional ByVal vLower As Variant = 0 _
    , Optional ByVal vUpper As Variant = 1 _
    ) As Variant

Beta Cumulative Distribution Function (like Excel Version)

Examples: 
    BetaCDFExcel(1.0, 8, 10, 1, 3) = 0
    BetaCDFExcel(1.5, 8, 10, 1, 3) = 4.02367801871164E-02
    BetaCDFExcel(2.0, 8, 10, 1, 3) = 0.685470581054688
    BetaCDFExcel(2.5, 8, 10, 1, 3) = 0.996899220859632
    BetaCDFExcel(3.0, 8, 10, 1, 3) = 1
See also: 
    BetaCDF Function
    BetaInverseExcel Function
    BetaRandom Function
    BetaPDF Function
    Declarations Topic
    BetaI Function
    BETADIST Function (Microsoft Excel)
vX: Function returns Null if vX is less than vLower or greater than vUpper.
vAlpha: Function returns Null if vAlpha is less than or equal to zero (<=0).
vBeta: Function returns Null if vBeta is less than or equal to zero (<=0).
vLower: Function returns Null if vLower is greater than or equal to vUpper.
vUpper: Function returns Null if vUpper is less than or equal to vLower.

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