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Beta CDF Function
Math Probability Class

Public Function BetaCDF( _
      ByVal vX As Variant _
    , ByVal vAlpha As Variant _
    , ByVal vBeta As Variant _
    ) As Variant

Beta Cumulative Distribution Function

Examples: 
    BetaCDF(0.0, 8, 10) = 0
    BetaCDF(0.1, 8, 10) = 1.056463568731E-04
    BetaCDF(0.5, 8, 10) = 0.685470581054688
    BetaCDF(0.9, 8, 10) = 0.999999000221878
    BetaCDF(1.0, 8, 10) = 1
See also: 
    BetaCDFExcel Function
    BetaInverse Function
    BetaRandom Function
    BetaPDF Function
    Declarations Topic
    BETADIST Function (Microsoft Excel)
    BetaI Function
vX: Function returns Null if vX cannot be fixed up to a Double precision floating point number.
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).

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