Cited by 9,793Evolution and Paleontology StudiesMorphological variations and asymmetryGenomics and Phylogenetic Studies

Phylogenies and the Comparative Method

Felsenstein, Joseph·1985·The American Naturalist

Abstract

Comparative studies of the relationship between two phenotypes, or between a phenotype and an environment, are frequently carried out by invalid statistical methods. Most regression, correlation, and contingency table methods, including nonparametric methods, assume that the points are drawn independently from a common distribution. When species are taken from a branching phylogeny, they are manifestly nonindependent. Use of a statistical method that assumes independence will cause overstatement of the significance in hypothesis tests. Some illustrative examples of these phenomena have been given, and limitations of previous proposals of ways to correct for the nonindependence have been discussed. A method of correcting for the phylogeny has been proposed. It requires that we know both the tree topology and the branch lengths, and that we be willing to allow the characters to be modeled by Brownian motion on a linear scale. Given these conditions, the phylogeny specifies a set of contrasts among species, contrasts that are statistically independent and can be used in regression or correlation studies. The considerable barriers to making practical use of this technique have been discussed.

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Crossref · 10.1086/284325

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  • Standardized independent contrasts were calculated for each factor to account for shared ancestry.

    “We calculated standardized independent contrasts (FIC: Felsenstein 1985) for each of the above factors (territoriality, shoulder height, body mass, habitat openness and group size) using the PDTREE module (Midford et al. 2005) in Mesquite 2.5 (Maddison & Maddison 2008) to account for shared ancestry.”

    From Evolution of weaponry in female bovids (2009) · cites this paper as Felsenstein 1985

  • EMMLi analysis on phylogenetic independent contrasts supported the same most likely model and relative strength of correlations within and among modules as the analysis of raw data.

    “To test the effects of shared ancestry on trait correlations, we also carried out EMMLi analysis on the phylogenetic independent contrasts (45) of the landmark configurations. This analysis supported the same most likely model and relative strength of correlations within and among modules as the analysis of the raw data did.”
  • Because of shared phylogenetic descent, species data are likely not to represent statistically independent points, resulting in overestimation of degrees of freedom and increased Type I error rate.

    “Firstly, because of shared phylogenetic descent, species data are likely not to represent statistically independent points.This results in overestimation of degrees of freedom and an increased Type I error rate.”

    From Allometric scaling of mammalian metabolism (2005) · cites this paper as Felsenstein, 1985

  • The problem of nonindependence does not occur if characters respond essentially instantaneously to natural selection in the current environment, so that phylogenetic inertia is essentially absent.

    “Felsenstein also noted that the problem of nonindependence does not occur if”

    From Rethinking phylogenetic comparative methods (2018) · cites this paper as Felsenstein 1985

  • Felsenstein recovered a significant regression slope using Ordinary Least Squares despite there being no evolutionary covariance between the traits.

    “He then evolved traits according to a BM process along the phylogeny; he recovered a significant regression slope using Ordinary Least Squares (OLS) despite there being no evolutionary covariance between the traits.”

    From Rethinking phylogenetic comparative methods (2018) · cites this paper as Felsenstein 1985

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Authors
Felsenstein, J.
Affiliations
University of Washington (US)
Corresponding author
Felsenstein, Joseph
Venue
The American Naturalist
Published
1985-01
Volume
125
Issue
1
Pages
1-15
ISSN
  • 0003-0147 (ISSN-L)
  • 1537-5323
OpenAlex
W2013410948
Cited by
9,793
References
13
Citations by year
2026: 242 · 2025: 311 · 2024: 287 · 2023: 361 · 2022: 335 · 2021: 391 · 2020: 332 · 2019: 465 · 2018: 375 · 2017: 374 · 2016: 374 · 2015: 399 · 2014: 436 · 2013: 342 · 2012: 343
FWCI
40.48
Type
journal article
Language
en
Open access
closed
Locations
The American Naturalist (publishedVersion)
Funders
  • U.S. Department of Energy
  • University of Washington
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Physical Sciences › Mathematics › Geometry and Topology › Morphological variations and asymmetry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
phylogenetic comparative analysis, Brownian motion model, branch length, tree topology, contingency tables, character evolution

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