Pitney Bowes MapInfo Professional - Manual (Page 299)

3. Select (or create and select) one or more map objects from any layer in the Map window. This is the
modifying object.
4. On the Objects menu, click Combine. The Data Aggregation dialog box displays.
5. Choose the appropriate aggregation method (or No Data) for each field in the Destination list. See
the definitions for these methods in Aggregating and Disaggregating Data .
To select more than one field in the Data Aggregation dialog box at a time, use these
keystrokes: Note:
• Shift-click to apply the same method to consecutive fields
• Ctrl-click for non-consecutive fields.
When you have chosen the aggregation methods for each field, click OK.
6. Select one or more columns by clicking in the list at the top of the Data Aggregation dialog box.
7. Choose a data aggregation method: Blank, No Change, Value, Sum, Average, or Weighted
Average. (Depending on whether you specified an editing target, some of these aggregation methods
may not be available.) MapInfo Professional updates the column list in the upper half of the dialog
box to show the chosen method.
• For example, if you choose Average, you are telling MapInfo Professional to calculate the average
of the column values of all the selected objects. This average is stored in the column of the new
row.
• Aggregation methods are described below.
8. Repeat steps 6 and 7 for all columns in your table and click OK.
• To simplify this process, select multiple columns at one time by Shift-clicking and/or Ctrl-clicking
in the list of columns. If you select multiple columns, and then choose an aggregation method,
MapInfo Professional applies that method to all selected columns.
If your table contains a large number of columns, it can be time-consuming to specify aggregation
methods for all columns. However, MapInfo Professional remembers your aggregation methods for the
remainder of your session; thus, the next time you choose Combine, you do not need to respecify all
aggregation options.
MapInfo Professional computes the new object and displays it as a single object. Use the Info tool to
view the aggregated data (if any) associated with the object.
299 MapInfo Professional User Guide
Chapter 11: Buffering and Working with Objects