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Percent Rank Function
Math Statistics Class

Public Function PercentRank( _
      ByVal vN As Variant _
    , ParamArray vValues() As Variant _
    ) As Variant

Returns the rank of a value as a percentage of the values in the data set.
Inverse of the Percentile function.

Examples: 
    PercentRank(12, 12, 34, 56) = 0.00
    PercentRank(23, 12, 34, 56) = 0.25
    PercentRank(34, 12, 34, 56) = 0.50
    PercentRank(45, 12, 34, 56) = 0.75
    PercentRank(56, 12, 34, 56) = 1.00
See also: 
    Percentile Function
    Rank Function
    Quartile Function
    TrimMean Function
    Small Function
    Large Function
    PERCENTRANK Function (Microsoft Excel)
vN: The value whose corresponding percentile will be returned. Must be between the minimum and maximum values in vValues inclusive.
vValues: The values that are to be processed. Can be numbers, one-dimensional numeric arrays, one-dimensional Variant arrays, one-dimensional Variant arrays with embedded arrays, or any combination of these. The current setting of the StatVarType Property determines which numeric data types are recognized by this function.
Return value: Function returns the percent rank of the value vN, or it will use interpolation to determine the percent rank if vN is not a value in vValues. Function returns Null if none of the vValues arguments are numeric, or if vN is not between the minimum and maximum values in vValues inclusive.

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