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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