Stddev

Calculates the standard deviation of the specified set. The calculation is based upon a sample of a population. Standard deviation is a measure of how widely values are dispersed from their mean (average).

Syntax

Stddev ( set [,numeric_value_expression [,IncludeEmpty] ])

Parameter	Description
set	A valid MDX set specification.
numeric_value_expression	A numeric value or an expression that returns a numeric value (see MDX Grammar Rules).
IncludeEmpty	Use this keyword if you want to include in the calculation any tuples with #MISSING values. Otherwise, they are omitted by default.

Example

The following example, based on Sample Basic, calculates the standard deviation (based on a sample of a population) of the January sales values for all products sold in New York.

WITH MEMBER [Measures].[Std Deviation]
AS
 'Stddev(
    Crossjoin(
     {[Product].Children}, {[Measures].[Sales]}
    )
  )
 ' 
SELECT
 {[Scenario].[Actual],[Scenario].[Budget]}
ON COLUMNS, 
   {Crossjoin(
     {[Measures].[Sales]},{[Product].Children}
    ),
    Crossjoin(
     {[Measures].[Sales], [Measures].[Std Deviation]},
     {[Product]}
    )}
ON ROWS
FROM 
 Sample.Basic
WHERE
 ([Year].[Jan], [Market].[New York])

This query returns the following grid:

(axis)	Actual	Budget
(Sales, 100)	678	640
(Sales, 200)	551	530
(Sales, 300)	663	510
(Sales, 400)	587	620
(Sales, Diet)	#Missing	#Missing
(Sales, Product)	2479	2300
(Std Deviation, Product)	60.723	64.55