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t Inverse Function
Math Probability Class

Public Function tInverse( _
      ByVal vProbability As Variant _
    , ByVal vDF As Variant _
    , Optional ByVal vTails As Variant = 2 _
    ) As Variant

Inverse t Cumulative Distribution Function

See also: 
    tCDF Function
    tRandom Function
    tPDF Function
    Declarations Topic
    TINV Function (Microsoft Excel)
vProbability: Function returns Null if vProbability is not between 0 and 1 inclusive.
vDF: Number of degrees of freedom. Number is rounded to the nearest integer. Function returns Null if vDF is less than or equal to zero (<=0).
vNumTails: The number of tails on the distribution, either one or two. Number is truncated to the nearest integer. Function returns Null if vNumTails is not either one (1) or two (2).

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