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Slope Function
Math Statistics Class

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

Returns the slope of the linear regression line through data points in vYValues and vXValues.

Examples: 
    Slope(Array(1, 3, 4), Array(2, 6, 9)) = 0.432432432432432
    Slope(Array(11, 44, 22), Array(15, 23, 12)) = 2.43814432989691
See also: 
    Intercept Function
    Forecast Function
    StandardError Function
    SLOPE 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 the slope of the linear regression line through data points in vYValues and vXValues. 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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