Calculate sum of under estimates

Question

I have a 2008 r2 cube with 2 measures EstmatedTime and ActualTime and a date dimension.  I need to calculate the sum of the under estimates.  So if my estimated hours on the 1st, 2nd and 3rd are 10, 10, 10  and my actual hours are 11, 12,
7, I need to return 3 as the sum of the under estimates for the period.  Is there a way to do this using MDX, or do I need to do it in the ETL?
John Schroeder

Answer 1

Hi JS,
Considering both the measures are at same granularity, try the below:
Create a calculated member :
with member [Measures].[Diff] as
iif(isempty([Measures].[EstmatedTime])=TRUE and isempty([Measures].[ActualTime]=TRUE,null,
iif([Measures].[ActualTime] > [Measures].[EstmatedTime],[Measures].[ActualTime] - [Measures].[EstmatedTime],0))
Now the result would be fine at Date level, but at a higher level say Month the result would not as expected, as the calculated member [Measures].[Diff] would be calculated after aggregating EstmatedTime and ActualTime at month level. In order to fix this
define a scope.
Scope( [DimDate].[DateHierarchy].[Month],[Measures].[Diff]);
This = Sum( Descendants( [DimDate].[DateHierarchy].CurrentMember,[DimDate].[DateHierarchy].[Date]),[Measures].[Diff]);
End Scope;
Similarly define scope for all higher datehierarchy levels.
Saurabh Kamath