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If your report is based on an OLAP data source that includes a Time dimension, you can create these custom calculations:

• the difference in a selected measure over a previous period or previous year.
• the percentage change of a selected measure over a previous period or previous year.
• a selected measure’s cumulative value to the current period.

Note: The cumulative function starts over with each calendar year.

Note: In addition to specifying that the dimension type is Time, you also must assign a type to each level in the Time hierarchy. The following screen capture from the Cube Designer wizard shows that the Year level has a type of YEAR, the Quarter level has a type of QUARTERS, and the Month level has a type of MONTHS.

To create a relative time calculation, perform these steps in the Select Data dialog box:

1. Click the Custom tab.
2. Select a measure in the Available measures field.
3. Select one of the options in the Functions drop-down list.



4. Click the arrow button to place your relative time expression in the Expression field. The expression is evaluated based on the aggregated values of the measures that you selected. (Within SAS Web Report Studio, it is not possible to produce a detailed calculation.)
5. Click Add to add your custom data item to the New items box.

Here is a percent change over previous year calculation:



Here are the results:

Note: You cannot type an expression that uses a relative time function. You must select the measure, then select the function, then click the arrow button to place the calculation into the Expression field. You also cannot edit the expression.

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