Righttailed Sum Diversity Ordering 
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The proportion of the total community made up of each species is arranged in descending order of abundance. Given a total of S species and a proportion of each species given by pj, then Ii is calculated as a coordinate pair where i is the number of species which are excluded from the summation, termed the order:
Therefore in a sample where many species have a similar abundance, the plot will descend slowly with increasing i, whereas in a sample heavily dominated by large numbers of just a few species, the plot will drop away steeply as i increases.
