# INF: How to Calculate the Cumulative Value of a Measure

### Summary

In a number of applications and business reports you want to obtain or return cumulative values for one or more measures. This article illustrates the use of the SUM, PeriodsToDate, YTD, QTD, and ITEM functions to return cumulative values over a period of time.

One approach to calculating cumulative values for a measure during all time requires the addition of an (All) level to the time dimension:

1. Open Analysis Manager, and then open the FoodMart 2000 database.
2. Edit the Time dimension and add an All level.
3. Process the Time dimension and the Sales cube. Adding the All level results in members being summed automatically.
4. Open the MDX sample application, and then select the FoodMart 2000 sample database.
5. Test the validity of the formula that you will be using for a calculated measure by executing this Multidimensional Expressions (MDX) query:
``WITH MEMBER MEASURES.[Sales To Date] AS 'Sum(PeriodsToDate([Time].[(All)]), [Measures].[Unit Sales])'SELECT   {[Measures].[Unit Sales],[Measures].[Sales To Date]} ON COLUMNS,    [Time].[Month].Members ON ROWSFROM [Sales]``
6. Note the values that display in the data grid.
MonthUnit SalesSales to Date
121,628.0021,628.00
220,957.0042,585.00
323,706.0066,291.00
420,179.0086,470.00
521,081.00107,550.00
621,350.00128,901.00
723,763.00152,664.00
821,697.00174,361.00
920,388.00194,749.00
1019,958.00214,707.00
1125,270.00239,977.00
1226,796.00266,773.00

7. Close the MDX sample application.
8. Edit the Time dimension and remove the All level. Re-process the Time dimension and the Sales cube.
An alternate approach to calculating cumulative values for a measure requires use of the ITEM function with the colon operator to sum over a range of times.

1. Open the MDX sample application, and then select the FoodMart 2000 database.
2. Test the validity of the formulas that you are going to use to calculate measures by executing this MDX query:
``WITH  MEMBER MEASURES.[Sales To Date] as 'SUM({[Time].CurrentMember.Level.Members}.Item(0):Time.CurrentMember,[Measures].[Unit Sales])'  -- Use the ITEM() function to return the first member then sum to the currentmember MEMBER MEASURES.[Sales Year To Date] AS 'SUM(YTD(),[Measures].[Unit Sales])'  -- Use the YTD() function to sum for Year To Date MEMBER MEASURES.[Sales Quarter To Date] as 'SUM(QTD(),[Measures].[Unit Sales])'  -- Use the QTD() function to sum for Quarter To DateSELECT   {[Measures].[Unit Sales],[Measures].[Sales To Date],[Measures].[Sales Year To Date],[Measures].[Sales Quarter To Date]} ON COLUMNS,    [Time].[Month].Members ON ROWSFROM [Sales]``
3. Close the MDX sample application.
4. Edit the Time dimension and change the All level to NO. Re-process the dimension and the Sales cube.
Now that you have tested the formulas for the calculated members, you can add the formulas to the Sales cube.

1. Open the Sales cube for editing.
2. Add a new calculated member with the following properties:

``Parent Dimension: MeasuresName            : Sales To DateValue           : SUM({[Time].CurrentMember.Level.Members}.Item(0):Time.CurrentMember,[Measures].[Unit Sales])Format String   : STANDARD``
Click OK to save the calculated member. This calculated member returns the value of the Unit Sales measure since the beginning of time.
3. Add a new calculated member with the following properties:

``Parent Dimension: MeasuresName            : Sales Year To DateValue           : SUM(YTD(),[Measures].[Unit Sales])Format String   : STANDARD``
Click OK to save the calculated member. This calculated member returns the value of the Unit Sales measure for the year to date.
4. Click OK to save the calculated member. This calculated member returns the value of the Unit Sales measure for the quarter to date.
``Parent Dimension: MeasuresName            : Sales Quarter To DateValue           : SUM(QTD(),[Measures].[Unit Sales])Format String   : STANDARD``
5. Browse the cube data and note the values that display in the newly added calculated members.
MonthUnit SalesSales to DateSales Year to DateSales Quarter to Date
121,628.0021,628.0021,628.0021,628.00
220,957.0042,585.0042,585.0042,585.00
323,706.0066,291.0066,291.0066,291.00
420,179.0086,470.0086,470.0020,179.00
521,081.00107,550.00107.550.0041,260.00
621,350.00128,901.00128.901.0062,610.00
723,763.00152,664.00152,664.0023,763.00
821,697.00174,361.00174.361.0045,460.00
920,388.00194,749.00194,749.0065,848.00
1019,958.00214,707.00214,707.0019,958.00
1125,270.00239,977.00239,977.0045,228.00
1226,796.00266,773.00266,773.0072,024.00
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ID articol: 301637 - Ultima examinare: 12 iun. 2008 - Revizie: 1