Calculates the sexual dimorphism index of Lovich & Gibbons (1992):
(larger sex / smaller sex) - 1 and arbitrarily made positive when
females are the larger sex or negative when males are the larger sex.
Character object naming a trait in
Data frame which must contain at least three columns: one
containing trait names that match
A numeric representing the calculated sexual dimorphism index for
Lovich, JE & Gibbons, JW. 1992. A review of techniques for quantifying sexual size dimorphism. Growth, Development, and Ageing 56(4):269-281.
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