Window calculations provide the capability to apply specific computations to measure values and allow you to perform different analytical tasks such as computing running totals, percentages of totals, differences, etc.
To create a window calculation, invoke the Binding menu and click the required measure. In the invoked data item menu, go to Calculations and select one of the available calculations.

 Percent of Total  A calculation is used to compute a percentage of the total for the specified measure across a window.
 Running Summary  Can be used to compute a cumulative total for the specified measure across a window.
 Difference  Can be used to compute the difference between measure values across a window.
 Percentage Difference  A calculation is used to compute the difference in percentages between measure values across a window.
 Moving  The Moving calculation uses neighboring values to calculate a total.
 Rank  Use the Rank calculation to compute rankings for the specified measure across a window.
 Custom  Use Custom to specify a custom calculation by adding the required calculation functions inside the measure expression.

After you have selected the required calculation, you can change its default settings by clicking the Edit button (the icon).
This invokes the window containing common and specific calculation settings.
NOTE
The dashboard control does not allow sorting by measures with applied Window Calculations since the calculation value can depend on the calculated element position.
Percent of Total
In the Grid below, Percent of Total is applied to a fourth column to show a contribution of individual quarterly sales to total sales.
Running Summary
In the Grid below, the Running Total is applied to a fourth column to display cumulative sales across all quarters.
Difference
In the Grid below, the Difference is applied to a fourth column to show absolute differences between quarterly sales.
Percentage Difference
In the Grid below, Percentage Difference is applied to a fourth column to show percentage differences between quarterly sales.
Moving
In the Grid below, a Moving calculation is applied to a fourth column to show a moving average across all quarters.
Rank
In the Grid below, a Rank calculation is applied to a fourth column to show a ranking of sales for individual quarters.
Custom