Margalef D 
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This window displays the index calculated separately for each chosen sample.
Margalef's D has been a favourite index for many years. It is calculated as the species number (S) minus 1 divided by the logarithm of the total number of individuals (N). This program uses the natural logarithm:
To compare two indices see Testing for significant differences between indices.
A simple plot of the way the index changes between samples is displayed by clicking on the Graph tab on the output window.
