Consistency index

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consistency index (ci, CI)

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Definition

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

  • A measure of the amount of homoplasy in a character relative to a given cladogram. The consistency index is calculated as the ratio of m, the minimum number of steps a character can exhibit on any cladogram, to s, the minimum number of steps the same character can exhibit on the cladogram in question. See also ensemble consistency index, retention index.

Glossary of Plant Systematics (1st ed.) by Simpson (2006)

  • A measure of the relative amount of homoplasy in a cladogram, equal to the ratio of the minimum possible number of character state changes to the actual number of changes that occur.

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