Graphs in phylogenetic comparative analysis: Anscombe's quartet revisited

Liam J. Revell, Klaus Schliep, Eugenio Valderrama, James E. Richardson

    Research output: Contribution to journalArticlepeer-review

    6 Scopus citations

    Abstract

    In 1973, the statistician Francis Anscombe used a clever set of bivariate datasets (now known as Anscombe's quartet) to illustrate the importance of graphing data as a component of statistical analyses. In his example, each of the four datasets yielded identical regression coefficients and model fits, and yet when visualized revealed strikingly different patterns of covariation between x and y. Phylogenetic comparative methods (the set of methodologies that use phylogenies, often combined with phenotypic trait data, to make inferences about evolution) are statistical methods too; yet visualizing the data and phylogeny in a sensible way that would permit us to detect unexpected patterns or unanticipated deviations from model assumptions is not a routine component of phylogenetic comparative analyses. Here, we use a quartet of phylogenetic datasets to illustrate that the same estimated parameters and model fits can be obtained from data that were generated using markedly different procedures—including pure Brownian motion evolution and randomly selected data uncorrelated with the tree. Just as in the case of Anscombe's quartet, when graphed the differences between the four datasets are quickly revealed. The intent of this article is to help build the general case that phylogenetic comparative methods are statistical methods and consequently that graphing or visualization should invariably be included as an essential step in our standard data analytical pipelines. Phylogenies are complex data structures and thus visualizing data on trees in a meaningful and useful way is a challenging endeavour. We recommend that the development of graphical methods for simultaneously visualizing data and tree should continue to be an important goal in phylogenetic comparative biology.

    Original languageEnglish (US)
    Pages (from-to)2145-2154
    Number of pages10
    JournalMethods in Ecology and Evolution
    Volume9
    Issue number10
    DOIs
    StatePublished - Oct 1 2018

    All Science Journal Classification (ASJC) codes

    • Ecology, Evolution, Behavior and Systematics
    • Ecological Modeling

    Author Keywords

    • Concept

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