THE RETENTION INDEX AND THE RESCALED CONSISTENCY INDEX

@article{Farris1989THERI,
  title={THE RETENTION INDEX AND THE RESCALED CONSISTENCY INDEX},
  author={James S Farris},
  journal={Cladistics},
  year={1989},
  volume={5}
}
  • J. Farris
  • Published 1 December 1989
  • History
  • Cladistics
as a measure ol'6t ofa character to a tree, has been widely and successfully employed, but might be capable of some improvement for certain applications. 'The purpose of this note is to dcwrihe two new indices, already in use in Hennig86, and to explain their interpretation. The consistency index, 
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References

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The issue of choice among multiple equally parsimonious cladograms, and three statistics considered, are addressed: the consistency index, F-ratio, D and the D measure, an application of the Shannon entropy statistic from Gatlin (1972).

A Successive Approximations Approach to Character Weighting

Results indicate that the successive weighting procedure can be highly successful, even when cladistically reliable characters are heavily outnumbered by unreliable ones, and computer simulation tests of the technique are described.

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The purpose of this note is to point out a pitfall in the method of comparing the shapes of trees through their matrices of cladistic difference and to present a new method for comparing shapes of Trees which seems to present fewer difficulties than methods now in use.

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It is maintained that none of the arguments advanced in favor of these techniques is well-taken and that neither procedure is suitable for phylogenetic analyses.

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