Transforming and adjusting your data
20
5
Transforming and adjusting your data
Data transformations
Relativisations
Dealing with zeros
Transposing data
Transposing environmental variables
5.1
Data transformations
The values in the working data grids can be transformed using a variety of functions.
From the working data window select Transform in the Type of Adjustment panel.
The possible relative measures available within ECOM are given below. Select the
transformation to be made and click on Submit to make the change.  The
transformation options within ECOM are itemised below.
Revert to raw   This will cause the working data to revert to the raw data, so that
you can start your investigations again.
Log
10
   Each value is transformed to the log to base 10. This cannot be done for
numbers <= 0.
Log
10(x+1)
   Each value is transformed by adding 1 and then calculating the log to
base 10. This is used when the data contains zero values.
Log
e
   Each value is transformed to the log to base e (natural logs). This cannot be
done for numbers <= 0.
Log
e (x+1)
   Each value is transformed by adding 1 and then calculating the log to
base e. This is used when the data contains zero values.
Square root   the square root of each number is calculated. This cannot be done for
negative numbers.
Arcsin   The Arcsin of each value is calculated. A transformation often used for
percentage data.
Arcsin root   The Arcsin of the square root of each number is calculated.
Power   Each value, x, is transformed to x
a
, where a is chosen by the user.
Add constant   A constant value, chosen by the user, is added to each value.
Subtract constant   A constant value, chosen by the user is subtracted from each
value.
Multiply by constant   Each value is multiplied by a constant value chosen by the
user.
Divide by constant   Each value is divided by a constant value chosen by the user.
See also:
Transforming environmental variables
Copyright 2004  PISCES Conservation Ltd





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