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What is meant by phylogenetic dependence versus phylogenetic independence in phenotypic relationships

What is meant by phylogenetic dependence versus phylogenetic independence in phenotypic relationships

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Phylogenetic comparative method use information on the historical relationship of lineages (phylogenies). The standardized contrast are used in conventional statistical procedures with the constraint that all regressions, coreralations, etc must pass through the origin.

The method of independent contrast uses phylogenetic information to transform interspecific data into values , that in principle are independent and identically distributed , and hence can be analysed with standard methods like regressions.  

This phylogenetic dependence implies that species cannot be treated as independent units , hampering the application of conventional statistical procedures. ( generalised linear models ) in a general nonmark recapture context.

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