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The measure of population diversity is based on a recursive definition of diversity according to the principle of monotony in species, which states that the diversity of a group cannot decrease if new elements are added. According to the Weitzman principle, the diversity of a group is the maximum, against any one of its elements, of the distance between that particular one and its nearest neighbor increased by the diversity of the group without this element.

The WeitzPro program calculates the overall diversity of the group and the marginal diversity of each element or of one of its sub-groups of elements and provides the different steps of the corresponding algorithm (affiliation and representatives). The Weitzman.tree program generates a graphic representation of the tree with the contribution of each element to diversity.

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