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Calculations
Calculations enable you to set the value of a data item by performing a calculation that uses the value entered in one or more related items.
Consider this example:
A form might contain items for Wrist Circumference, Weight, and Frame Size. Wrist Circumference and Weight are regular items for which users enter data. Frame Size is a calculated control; the data that populates this item is the result of a calculation performed with values entered in the Wrist Circumference and Weight items.
When designing calculations, avoid changing the data type of the data that populates the target item. When a calculation changes the data type, reports that contain the target item do not return data on that item.
