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Forecast Function
Math Statistics Class

Public Function Forecast( _
      ByVal vX As Variant _
    , ByRef vYValues As Variant _
    , ByRef vXValues As Variant _
    ) As Variant

Predicts a future Y value for a specified X value using linear regression.

Examples: 
    Forecast(0, Array(1, 3, 4), Array(2, 6, 9)) = 0.216216216216216
    Forecast(2, Array(1, 3, 4), Array(2, 6, 9)) = 1.08108108108108
    Forecast(5, Array(1, 3, 4), Array(2, 6, 9)) = 2.37837837837838
See also: 
    Slope Function
    Intercept Function
    StandardError Function
    FORECAST Function (Microsoft Excel)
vYValues: Dependent set of data. Numeric-type array or Variant array containing only numeric elements. This function is NOT affected by the current setting of the StatVarType Property. It assumes that vYValues is an array that contains only numeric elements.
vXValues: Independent set of data. Numeric-type array or Variant array containing only numeric elements. This function assumes that vXValues is an array that contains only numeric elements.
Return value: Function returns a future Y value for the specified X value. Function returns Null if the arrays vYValues and vXValues contain a different number of elements, if both arrays are empty, or if there is some type of error, such as if the argument is a Variant array which contains an Object reference or String.

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