20.5 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.

    1 ∑n     x  +x  + x + x + ...+ x
�x = --   xi =-1----2---3---4--------n
    n i=1                 n
(8)

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

      (  ∑n   )           (                         )
�xrel =  1-   xi ⋅-1 ⋅100 =  x1 +-x2 +-x3-+-x4 +-...+-xn ⋅ 1-⋅100
        n i=1     xi                    n               xi
(9)

20.5.1 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.

Figure 62Mean Properties Dialog