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Correlation Function
Math Statistics Class

Public Function Correlation( _
      ByRef vXValues As Variant _
    , ByRef vYValues As Variant _
    ) As Variant

Returns the correlation coefficient of arrays vXValues and vYValues.

Examples: 
    Correlation(Array(12, 34, 56), Array(23, 45, 67)) = 1
    Correlation(Array(12, 34, 56), Array(11, 22, 44)) = 0.981980506061966
See also: 
    Covariance Function
    StandardDeviation Function
    AverageDeviation Function
    DeviationsSquared Function
    CORREL Function (Microsoft Excel)
vXValues: First 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 vXValues is an array that contains only numeric elements.
vYValues: Second set of data. Numeric-type array or Variant array containing only numeric elements. This function assumes that vYValues is an array that contains only numeric elements.
Return value: Function returns the correlation coefficient for the arrays vXValues and vYValues. Function returns Null if the arrays vXValues and vYValues 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.
v1.5 Note: This function replaces the CorrelationVariantVector function, which has been removed from ArrayArithmetic Class. This function is slightly different in that it examines all of the elements in the array from its lower bound through its upper bound.

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