#### 22.5 Mean

The connection function Mean calculates the arithmetic mean value for each unit
over more than one selected file for each unit.NODATA values are excluded from the
calculation.

| (7) |

Optionally relative values can be calculated as a percentage of the mean in
relation to one of the selected files according to the formula

| (8) |

##### 22.5.1 The Mean Settings Dialog

As a default mean values are calculated. Check the box for relative values and select
the relative source to calculate relative values.