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SKEWNESS AND PERMUTATION
Author(s) -
Källersjö Mari,
Farris James S.,
Kluge Arnold G.,
Bult Carol
Publication year - 1992
Publication title -
cladistics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.323
H-Index - 92
eISSN - 1096-0031
pISSN - 0748-3007
DOI - 10.1111/j.1096-0031.1992.tb00071.x
Subject(s) - permutation (music) , skewness , mathematics , phylogenetic tree , character (mathematics) , tree (set theory) , degree (music) , combinatorics , measure (data warehouse) , statistics , algorithm , biology , computer science , data mining , geometry , physics , acoustics , gene , biochemistry
— The skewness criterion of phylogenetic structure in data is too sensitive to character state frequencies, is not sensitive enough to number of characters (degree of corroboration) and relies on counts of arbitrarily‐resolved bifurcating trees. For these reasons it can give misleading results. Permutation tests lack those drawbacks and can be performed quickly by using approximate parsimony calculations, but the test based on minimal tree length can imply strong structure in ambiguous data. A more satisfactory test is obtained by using a support measure which takes multiple trees into account.

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