RANDOM DATA, HOMOPLASY AND INFORMATION

@article{Goloboff1991RANDOMDH,
  title={RANDOM DATA, HOMOPLASY AND INFORMATION},
  author={Pablo A. Goloboff},
  journal={Cladistics},
  year={1991},
  volume={7}
}
  • P. Goloboff
  • Published 1 December 1991
  • Economics
  • Cladistics
It is often assumed that homoplasy makes cladistic results uncertain. The minimum values that the consistency index C (Kluge and Fart-is, 1969) can achieve on most parsimonious trees decrease with number of taxa and have a more complex dependence with number of characters. Those minimum values have never been calculated, and therefore it is not known which values of C would indicate that there is as much homoplasy as is possible in a data set of a given size. Several authors have examined this… 

HOMOPLASY AND THE CHOICE AMONG CLADOGRAMS

  • P. Goloboff
  • Economics
    Cladistics : the international journal of the Willi Hennig Society
  • 1991
Despite some recent assertions to the contrary, the consistency index is an appropriate measure of homoplasy (= deviation from hierarchy).

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Maximum Parsimony and the Skewness Test: A Simulation Study of the Limits of Applicability

Large-scale computations with simulated phylogenetic data are employed to estimate the probability that MP succeeds in finding the true phylogeny for up to twelve taxa and 256 characters, and the skewness test of Hillis is found to perform well on simulated data.

The Role of Permutation Tail Probability Tests in Phylogenetic Systematics

Investigation of cladistic structure (Faith and Cranston, 1991) and Karl Popper's (1959) concept of corroboration demonstrated that PTP testing is hypothetico-deductive and consistent with Popperian corroboration and suggested that P TP-style testing provides a Popperians justification for cladistic parsimony.

CLADISTICS: WHAT'S IN A WORD?

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  • P. Goloboff
  • Economics
    Cladistics : the international journal of the Willi Hennig Society
  • 1991
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Homoplasy Excess Ratios: New Indices for Measuring Levels of Homoplasy in Phylogenetic Systematics and a Critique of the Consistency Index

Hers is shown to be more appropriate than CI in comparative taxonomic studies that wish to measure the average level of homoplasy in data sets involving different groups of taxa or different characters, and a new index, the Homoplasy excess ratio (HER), is introduced that takes into account the expected increase in overall homoplASY levels with increasing numbers ofTaxa in systematic studies.

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Abstract Archie (1990) prefers his “homoplasy excess ratio” HER to Farris' (1989) 1 ensemble retention index R. HER, he writes, lacks R's defects: R's minimum is not zero, and varies with number of

THE SEVENTH ANNUAL MEETING OF THE WILLI HENNIG SOCIETY

The single most parsimonious cladogram from the combined data supported the monophyly of the Agaricales and made little difference whether or not the transition-transversion bias was taken into account in the phylogenetic analysis of the molecular data.