StdevP (MDX)

Returns the population standard deviation of a numeric expression evaluated over a set, using the biased population formula (dividing by n).


StdevP(Set_Expression [ ,Numeric_Expression ] )


  • Set_Expression
    A valid Multidimensional Expressions (MDX) expression that returns a set.
  • Numeric_Expression
    A valid numeric expression that is typically a Multidimensional Expressions (MDX) expression of cell coordinates that return a number.


The StdevP function uses the biased population formula, while the Stdev function uses the unbiased population formula.


The following example returns the standard deviation for Internet Order Quantity evaluated over the first three months of calendar year 2003 using the biased population formula.

WITH MEMBER Measures.x AS 
   ( { [Date].[Calendar].[Month].[January 2003],
       [Date].[Calendar].[Month].[February 2003],
       [Date].[Calendar].[Month].[March 2003]},
    [Measures].[Internet Order Quantity])
SELECT Measures.x ON 0
FROM [Adventure Works]

See Also


MDX Function Reference (MDX)

Help and Information

Getting SQL Server 2005 Assistance

Change History

Release History

17 July 2006

Changed content:
  • Updated syntax and arguments to improve clarity.
  • Added updated examples.