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Updated: Oct 9, 2025

Generating Strictly Controlled Stimuli for Figure Recognition Experiments
Published on: March 18, 2019
SKEWNESS AND PERMUTATION
Mari Källersjö1,2, James S Farris1,3, Arnold G Kluge4
1Naturhistoriska riksmuseet, Molekylärsystematiska laboratoriet, Box 50007, S-104 05 Stockholm, Sweden.
Abstract:
Abstract- 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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