2016
DOI: 10.1111/2041-210x.12511
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Evaluating modularity in morphometric data: challenges with the RV coefficient and a new test measure

Abstract: Summary1: Modularity describes the case where patterns of trait covariation are unevenly dispersed across traits. Specifically, trait correlations are high and concentrated within subsets of variables (modules), but the correlations between traits across modules are relatively weaker. For morphometric datasets, hypotheses of modularity are commonly evaluated using the RV coefficient, an association statistic used in a wide variety of fields.2: In this article I explore the properties of the RV coefficient usin… Show more

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Cited by 212 publications
(337 citation statements)
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References 69 publications
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“…Each hypothesis was tested with a set of 10,000 random spatially contiguous partitions. Although the use of RV coefficients was recently criticized as being sensitive to differences in sample size and variable count (Adams, ), the use of alternative approach on dataset by Jojić et al. () yielded the same result regarding modularity.…”
Section: Methodsmentioning
confidence: 96%
“…Each hypothesis was tested with a set of 10,000 random spatially contiguous partitions. Although the use of RV coefficients was recently criticized as being sensitive to differences in sample size and variable count (Adams, ), the use of alternative approach on dataset by Jojić et al. () yielded the same result regarding modularity.…”
Section: Methodsmentioning
confidence: 96%
“…To measure modularity, we used the covariance ratio (CR) coefficient proposed by Adams (). CR is defined as CR=italictrace()V12V21traceV11V11traceV22V22where the components V are the same as in equation , except that V 11 ' and V 22 ' are the within‐partition covariance matrices with all diagonal elements set to 0.…”
Section: Methodsmentioning
confidence: 99%
“…Phylogenetic modularity was quantified using the covariance ratio (CR) coefficient performed in the R-package Geomorph 52. In this analysis, the degree of phylogenetic modularity between the face and braincase modules was quantified under a Brownian motion model of evolution.…”
Section: Methodsmentioning
confidence: 99%