How to aggregate column values

Several functions are available to aggregate values of a value column. Aggregation means that you get one aggregate value, for instance the average or the sum, of a whole column, or one value per group of class names. In this way, you can for instance calculate the total area of each class. Sometimes one item is considered to be more important than another item. Then, weight values may be used during the calculation to express this difference in importance.

Aggregations:

To perform an aggregation through the menu of a table window:

The Aggregate Column dialog box appears.

In the Aggregate Column dialog box:

For examples of aggregations, click the aggregations functions described below.

To perform aggregations using the command line of a table window:

Aggregation 'functions' can have 1, 2, or sometimes 3 arguments:

Notes:

See also: