Cited by 190Genomics and Phylogenetic StudiesMarkov Chains and Monte Carlo MethodsGenetic diversity and population structure

Identifiability of Parameters in MCMC Bayesian Inference of Phylogeny

Rannala, Bruce·2002·Systematic Biology

Abstract

Methods for Bayesian inference of phylogeny using DNA sequences based on Markov chain Monte Carlo (MCMC) techniques allow the incorporation of arbitrarily complex models of the DNA substitution process, and other aspects of evolution. This has increased the realism of models, potentially improving the accuracy of the methods, and is largely responsible for their recent popularity. Another consequence of the increased complexity of models in Bayesian phylogenetics is that these models have, in several cases, become overparameterized. In such cases, some parameters of the model are not identifiable; different combinations of nonidentifiable parameters lead to the same likelihood, making it impossible to decide among the potential parameter values based on the data. Overparameterized models can also slow the rate of convergence of MCMC algorithms due to large negative correlations among parameters in the posterior probability distribution. Functions of parameters can sometimes be found, in overparameterized models, that are identifiable, and inferences based on these functions are legitimate. Examples are presented of overparameterized models that have been proposed in the context of several Bayesian methods for inferring the relative ages of nodes in a phylogeny when the substitution rate evolves over time.

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Crossref · 10.1080/10635150290102429

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  • Modelling too many parameters can lead to a loss of power to distinguish between variants of a model.

    “In addition, modelling too many parameters can lead to a loss of power to distinguish between variants of a model 59 .”

    From The modern molecular clock (2003) · cites this paper as [59]

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Authors
Rannala, B.
Affiliations
University of Alberta (CA)
Corresponding author
Rannala, Bruce
Venue
Systematic Biology
Published
2002-09-01
Volume
51
Issue
5
Pages
754-760
ISSN
  • 1063-5157 (ISSN-L)
  • 1076-836X
OpenAlex
W2107808362
Cited by
190
References
17
Citations by year
2026: 4 · 2025: 2 · 2024: 4 · 2023: 2 · 2022: 8 · 2021: 6 · 2020: 4 · 2019: 16 · 2018: 7 · 2017: 5 · 2016: 5 · 2015: 9 · 2014: 23 · 2013: 8 · 2012: 13
FWCI
2.09
Type
journal article
Language
en
Open access
closed
Locations
  • Systematic Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Human Genome Research Institute (HG 01988, R01HG001988)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Physical Sciences › Mathematics › Statistics and Probability › Markov Chains and Monte Carlo Methods
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
Keywords
parameter identifiability, overparameterized models, Bayesian phylogenetics, MCMC convergence, node age estimation
MeSH terms
Algorithms, Bayes Theorem, Biological Evolution, Markov Chains, Models, Genetic, Monte Carlo Method, Phylogeny, Time Factors, Evolution, Molecular

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