Phylogenetic Analysis and Comparative Data: A Test and Review of Evidence

@article{Freckleton2002PhylogeneticAA,
  title={Phylogenetic Analysis and Comparative Data: A Test and Review of Evidence},
  author={Robert P. Freckleton and Paul H. Harvey and Mark Pagel},
  journal={The American Naturalist},
  year={2002},
  volume={160},
  pages={712 - 726}
}
The question is often raised whether it is statistically necessary to control for phylogenetic associations in comparative studies. To investigate this question, we explore the use of a measure of phylogenetic correlation, λ, introduced by Pagel (1999), that normally varies between 0 (phylogenetic independence) and 1 (species’ traits covary in direct proportion to their shared evolutionary history). Simulations show λ to be a statistically powerful index for measuring whether data exhibit… 

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