Evolutionary Biology

, Volume 41, Issue 2, pp 336–350 | Cite as

Comparing Covariance Matrices by Relative Eigenanalysis, with Applications to Organismal Biology

Tools and Techniques

Abstract

Most biologists are familiar with principal component analysis as an ordination tool for questions about within-group or between-group variation in systems of quantitative traits, and with multivariate analysis of variance as a tool for one useful description of the latter in the context of the former. Less familiar is the mathematical approach of relative eigenanalysis of which both of these are special cases: computing linear combinations for which two variance–covariance patterns have maximal ratios of variance. After reviewing this common algebraic–geometric core, we demonstrate the effectiveness of this exploratory approach in studies of developmental canalization and the identification of divergent and stabilizing selection. We further outline a strategy for statistical classification when group differences in variance dominate over differences in group averages.

Keywords

Classification Covariance matrix Developmental canalization Morphometrics Natural selection Principal component analysis 

Notes

Acknowledgments

This research was supported by the Focus of Excellence grant “Biometrics of EvoDevo” from the Faculty of Life Sciences, University of Vienna, to Philipp Mitteroecker, and Grant DEB-1019583 to Fred Bookstein and Joseph Felsenstein from the National Sciences Foundation of the United States. We thank Katharina Puschnig for drawing the skull used in Figs. 6 and 8.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Department of AnthropologyUniversity of ViennaViennaAustria
  2. 2.Department of StatisticsUniversity of WashingtonSeattleUSA
  3. 3.Department of Theoretical BiologyUniversity of ViennaViennaAustria

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