Median function in SSAS is doing a sum instead

Hi, i am new to SSAS and mdx. I'm trying to get the median, however the function seems to return the sum of all record for that field/column group.
For example, this is the fact table that i have:
DEPT QUARTER
GROUP TIME
1 2012Q1
A 1
1 2012Q1
A 5
1 2012Q1
A 20
1 2012Q1
A 30
1 2012Q1
B 10
1 2012Q1
B 15
1 2012Q1
B 20
1 2012Q1
B 31
1 2012Q2
A 8
1 2012Q2
A 10
The result should be:
Median
DEPT QUARTER
GROUP MEDIANTIME
1 2012Q1
A 12.5
1 2012Q1
B 17.5
1 2012Q2
A 9
instead it's showing :
DEPT QUARTER
GROUP MEDIANTIME
All All
A 150
All All
B 150
All 2012Q1
A 132
All 2012Q1
B 132
All 2012Q2
A 18
etc.
The mdx is :
With MEMBER [Measures].[Median] AS Median([DIM GROUP].[GROUP].Members,
[Measures].[TIME])
SELECT {[Measures].[Median]} ON 0,
NonEmpty([DIM DEPT].[DEPT].MEMBERS)*NonEmpty([Dim DATE].[Quarter].MEMBERS)*NonEmpty([DIM GROUP].[GROUP].Members) ON 1
FROM [TIME CUBE]
Can someone please advise how to fix this? to get the median value instead of the sum of each group?
2 more questions that arose:
1. When i searched on the mdx syntax, some people recommend to have the [GROUP].[GROUP] repeated twice, can someone please explain the difference between [DIM GROUP].[GROUP].[GROUP].Members AND [DIM GROUP].[GROUP].Members?
2. Why do the "all" show up in the result, can we exclude it?
Thanks a lot in advance.
--Elys

Hi Elys ,
You should use the 'EXISTING' functionality .
With MEMBER [Measures].[Median] AS Median(EXISTING([DIM GROUP].[GROUP].Members),
[Measures].[TIME])
SELECT {[Measures].[Median]} ON 0,
NonEmpty([DIM DEPT].[DEPT].MEMBERS)*NonEmpty([Dim DATE].[Quarter].MEMBERS)*NonEmpty([DIM GROUP].[GROUP].Members) ON 1
FROM [TIME CUBE]
And for the 'All' member : If you have enabled 'AttributeHierarchyEnabled' property of GROUP to true (default), you will have an all member . Using [Dim Group].[Group].[Group] will exclude the 'All' member and will present only the actual groups .
Regards, David .

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