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- Title
Reliability of Bayesian posterior probabilities and bootstrap frequencies in phylogenetics.
- Authors
Erixon, Per; Svennblad, Bodil; Britton, Tom; Oxelman, Bengt
- Abstract
Many empirical studies have revealed considerable differences between nonparametric bootstrapping and Bayesian posterior probabilities in terms of the support values for branches, despite claimed predictions about their approximate equivalence. We investigated this problem by simulating data, which were then analyzed by maximum likelihood bootstrapping and Bayesian phylogenetic analysis using identical models and reoptimization of parameter values. We show that Bayesian posterior probabilities are significantly higher than corresponding nonparametric bootstrap frequencies for true clades, but also that erroneous conclusions will be made more often. These errors are strongly accentuated when the models used for analyses are underparameterized. When data are analyzed under the correct model, nonparametric bootstrapping is conservative. Bayesian posterior probabilities are also conservative in this respect, but less so.
- Publication
Systematic biology, 2003, Vol 52, Issue 5, p665
- ISSN
1063-5157
- Publication type
Journal Article
- DOI
10.1080/10635150390235485