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If you are deleting variables you are asked to select the variables for deletion
from the Select variables dialog box. This is similar to above except it also
shows N (number of occurrences), N2 (Hill's measure of effective number of
occurrences), and maximum value for each variable.
Clicking on the Advanced button invokes the Advanced options dialog box,
allowing rapid selection using N, N2 or maximum abundance criteria. For
example, clicking on the max button below would select all variables with a
maximum value of less than 1.0. This function can be used, for example, to
quickly delete rare species from a dataset.
18 • Data manipulation
User Guide C2