The Retention Index ( RI ) measures the amount of similarity in a character.
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The retention index of a certain chemical compound is its retention time normalised to the retention times of adjacently eluting n-alkanes.
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The retention index ( RI ) was proposed as an improvement of the CI " for certain applications " This metric also purports to measure of the amount of homoplasy, but also measures how well synapomorphies explain the tree.
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However, homology is usually determined from analysis of the results that are evaluated with homology measures, mainly the CI ( consistency index ) and RI ( retention index ), which, it has been claimed, makes the process objective.
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