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Table 3 Summary of statistical tests used to measure a posteriori the utility and interaction of data partitions.

From: Multi-locus phylogeny of dolphins in the subfamily Lissodelphininae: character synergy improves phylogenetic resolution

Tests

Question(s)

H0

Statistical test

Utility of each data partition to tree resolution

Does the strength of the signal decay for each partition as branch lengths increase?

No relationship between frequency of CI1 characters and branch length

Linear regression

 

Is there variation in the contribution of data partitions to node support relative to branch length?

Equal frequency of CI1 characters for each data partition across branch lengths

Chi-square

 

Is there variation in relative support a partition contributes to short and long branches?

Uniform proportion of CI1 for each data partition across branch lengths

Kruskal-Walis

Utility of 3rd codon positions

Are third positions less informative than other codon positions?

Uniform frequency of CI1 characters among codon positions

Chi-square

Conflict among data partitions in the simultaneous analysis

Is there evidence for interaction among data partitions?

Even distribution of PBS across node heights

Spearman's rank correlation

 

Does simultaneous analysis displace synapomorphies?

No displacement of synapomorphies (HS ≤ 0) in combined analysis

Sign test

  1. CI1 = characters with consistency index of 1 (CI = 1); HS = hidden synapomorphy index; PBS = partitioned Bremer support.