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Get the first of the month for a given date in MDX as well as compound interest

Posted on 2011-03-16
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Last Modified: 2014-05-04
How can I get the first non empty day from the calendar dimension.

Actually I am trying to implement a compount interest calculation


I can do that in two ways.  sum of total profit till date of month /principal as of first of date

I am not able to get the principal as of first date. I greatly appreciate is somebod has a code for it. I tried Opening Period but of no success. Getting Nulls at day level. Works at month level

the second way is

CREATE MEMBER CURRENTCUBE.[Measures].CUM_PNL_PCT
 AS ((1 + ([TradeDate].[TDHierarchy].PrevMember,Measures. [CUM_PNL_PCT])) * (1 + ([TradeDate].[TDHierarchy].CurrentMember, [Measures].[PNL Pct By Aum]))) - 1

The calc works if there are only time dimensions (Day on y axis and year and month of x axis).

If I have any other dimension it is failing.  Also I need to reset at any boundary (like new year).

Thanks.



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Question by:obtek
4 Comments
 
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huslayer earned 250 total points
Comment Utility
Hello,
just to let you get started...

The first day of the month is using the "OpenningPeriod"  function,

also check that it might help:
http://www.datawarehousingguide.com/microsoft-bi-interview-questions/26-mdx-interview-questions-time-based-function-.html


also these cheeats can help:
http://www.ssas-info.com/ssas-cheat-sheets


sorry can't help with the compound interest, hope someone else answers that.

Thanks
Jason
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Assisted Solution

by:Hwkranger
Hwkranger earned 250 total points
Comment Utility
To get the first day of a reporting period i use HEAD.

i've included an example that takes two metrics at the first day of the month and does a calculation between them.
CREATE MEMBER CURRENTCUBE.[MEASURES].[Open@Beg]
 AS (HEAD(EXISTING [Date].[Calendar].[Date]
            ,1)
            .item(0)
            ,[Measures].[Active Relationship])
-
(HEAD(EXISTING [Date].[Calendar].[Date]
            ,1)
            .item(0)
            ,[Measures].[New Relationship]), 
FORMAT_STRING = "#,#;(#,#);0;\-", 
VISIBLE = 1;

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