A report function that calculates the average of one field (column) from the data source. This function produces a running average, no global average. The function can be used in two ways:

to calculate an average value for the entire report
to calculate an average value within a particular group

This function expects its input values to be java.lang.Number instances.

The function understands two parameters:

field parameter is required and denotes the name of an ItemBand-field which gets summed up.
group parameter denotes the name of a group. When this group is started, the counter gets reset to null.

<function class="org.jfree.report.function.ItemAvgFunction" name="Actual_Avg">
  <properties>
     <property name="field">ACTUAL</property>
     <property name="group">RegionGroup</property>
  </properties>
</function>

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