85
ECOM II
 It is often the case that species vary greatly in abundance, over possibly 5 or more
orders of magnitude. When there is great variation in abundance consider making a
square root transformation. A log transformation might also be useful but most
species data sets include many zeros so you would need to use a log x+1
transformation and this can be misleading is there are many low abundance species.
During this preliminary stage you should also check for zero sum rows and columns in
your data sets as these will likely cause division by zero problems
later. This is done using the Handling zeros radio button on the Working data tabs.
Having completed these initial inspections we must now Examine and Select
Environmental Variables.
Interpreting the results
Copyright 2004  PISCES Conservation Ltd





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