Aggregator Class

Use the Aggregator class to aggregate the observations in a Variable. The Apply(Variable, Int32, Int32) method has two overloads. The first overload aggregates the observations of a variable over a specified interval and returns the result. The second overload aggregates the observations over intervals with the specified boundaries, and returns the results in a new variable.

A number of aggregators have been predefined. These are exposed as staticSharedstaticstatic (Shared in Visual Basic) fields and methods of the Aggregator class. These include aggregators that return the first, last, smallest and largest observation in an interval, as well as sums, averages, and other summary statistics.

To define a custom aggregator, create a class that inherits from Aggregator and overrides the Apply(Variable, Int32, Int32) method. In the class constructor, you should call the base constructor with one argument: the type of variable returned by the aggregator.