The Excel SKEW function calculates the skewness of the distribution of a supplied set of values.
Syntax: SKEW( number1, [number2], … )
Where the number arguments provide a minimum of 3 values that make up the data set. These can be individual numbers or arrays of numbers and can be input either directly, as returned values from other functions or formulas, or as references to cells containing values. In Excel 2007, you can input up to 255 number arguments to the Skew function, but in Excel 2003, you can only input up to 30 arguments.
Skew Function Example
Column A of the spreadsheet on the right shows 15 data values. The distribution of these values is shown in the chart below:
The skewness of the values in the spreadsheet can be calculated using the Excel Skew Function as follows:
This gives the result 0.863378312, indicating that the data set has a positive skew.
Skew Function Error
If you get an error from your Excel Skew function this is likely to be the Excel #DIV/0! error:
|#DIV/0!||–||Occurs if either Fewer than 3 data values have been supplied to the function or The sample standard deviation of the data points is zero|