21
ECOM II
5.2
Data relativisations
The values in each row or column of the working data can be transformed so that
their magnitudes are expressed relative to a variety of statistical measures. On the
Working Data page select Relative in the Type of Adjustment panel.
The possible relative measures available within ECOM are given below. In each case
where by row or column is not stated you can select which will be used. Select the
adjustment to be made and click on Submit to make the change.
By Maximum value   For each row or column the maximum value is found and all
values are divided by the maximum.
By Mean   For each row or column the mean value is found and all values are
subtracted from the mean.
By SD   For each row or column the standard deviation value is found and all values
are divided by the standard deviation.
Binary using Mean   For each row or column the mean is found and all values above
the mean are given the value 1 and all values below the mean zero.
Binary using Median   For each row or column the median is found and all values
above the median are given the value 1 and all values below the mean zero.
General by Row   This allows you to define a general relativisation to be applied to
each row. Each value is divided by
  
where i is the column and a is a user selected parameter (the default value is 1)
entered into the Enter value box displayed in the lower panel.
General by Column   This allows you to define a general relativisation to be applied
to each column. Each value is divided by
  
where j is the row and a is a user selected parameter (the default value is 1) entered
into the Enter value box displayed in the lower panel.
Copyright 2004  PISCES Conservation Ltd





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