AS 2005 Enterprise Edition allows you use semi-additive aggregation
functions, such as AverageOfChildren:
http://msdn2.microsoft.com/en-us/library/ms189734.aspx
Quote:
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Define Semiadditive Behavior (Business Intelligence Wizard) (SSAS)
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Semiadditive Function
Select the aggregation function for the selected measure. The following
table lists the aggregation functions that are available.
Value Description
AverageOfChildren
Aggregated by returning the average of the measure's children.
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- Deepak
Deepak Puri
Microsoft MVP - SQL Server
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