Ensemble retention index

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ensemble retention index (RI)

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Definition

Glossary of "Cladistics (2nd ed.)" by Kitching et al. (1998)

  • A measure of the amount of similarity in a data matrix that can be interpreted as synapomorphy on a given cladogram. The ensemble retention index is calculated is the ratio of (G - S) to (G - M), where G is the greatest number of steps that all characters can exhibit on any cladogram, M is the minimum number of steps all characters can exhibit on any cladogram and S is the minimum number of steps they can exhibit on the cladogram in question. See also retention index.

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