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StdevP (MDX)
SQL Server 2012
Returns the population standard deviation of a numeric expression evaluated over a set, using the biased population formula (dividing by n).
The StdevP function uses the biased population formula, while the Stdev function uses the unbiased population formula.
Example
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
StdevP
( { [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]
