Summarizing Data Values

After you have selected records you are interested in from the attribute table, you may want to summarize them. Click on the Summation (Sigma) icon on the toolbar to sum the records you have selected. In the resulting dialog box, input your categories and values to produce another table with your sums. For example, you have selected all the records where the area of the SWWet forest unit is greater than zero with the query tool (feature.Area.managedSWWet>0). In the sample dataset, 14 records are selected. Then with the summation tool, enter COMPART for the categories and MANAGEDAREA for the values and the result will be the number of hectares of managed area of forest unit SWWet within each compartment.