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1 July 2006 A COMMENT ON PHYLOGENETIC CORRECTION
F. James Rohlf
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Abstract

Statistical methods are now commonly used to take into account the expected lack of independence of observations across different species (due to their phylogenetic relatedness) when computing correlations or regressions among traits. The methods are often interpreted as removing that part of the regression or correlation that is an artifact due to phylogeny and there is an expectation that the corrected regression or correlation coefficients will usually be closer to zero. It is shown here that this is not an accurate way to interpret these methods. The effect of taking phylogeny into account is to reduce the variance of the estimated regression or correlation coefficients. Their means are not because since estimates of regression coefficients are unbiased whether or not the correct phylogeny is taken into account. Estimates of correlations are only slightly biased (and in the opposite direction that many expect).

F. James Rohlf "A COMMENT ON PHYLOGENETIC CORRECTION," Evolution 60(7), 1509-1515, (1 July 2006). https://doi.org/10.1554/05-550.1
Received: 29 September 2005; Accepted: 1 May 2006; Published: 1 July 2006
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KEYWORDS
bias
Comparative methods
generalized least-squares
independent contrasts
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