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dynesty: a dynamic nested sampling package for estimating Bayesian posteriors and evidences

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Speagle, Joshua S·2020·Monthly Notices of the Royal Astronomical Society

Abstract

We present dynesty, a public, open-source, python package to estimate Bayesian posteriors and evidences (marginal likelihoods) using the dynamic nested sampling methods developed by Higson et al. By adaptively allocating samples based on posterior structure, dynamic nested sampling has the benefits of Markov chain Monte Carlo (MCMC) algorithms that focus exclusively on posterior estimation while retaining nested sampling’s ability to estimate evidences and sample from complex, multimodal distributions. We provide an overview of nested sampling, its extension to dynamic nested sampling, the algorithmic challenges involved, and the various approaches taken to solve them in this and previous work. We then examine dynesty’s performance on a variety of toy problems along with several astronomical applications. We find in particular problems dynesty can provide substantial improvements in sampling efficiency compared to popular MCMC approaches in the astronomical literature. More detailed statistical results related to nested sampling are also included in the appendix.

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Metadata

Authors
Speagle, J. S.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2020-02-03
Volume
493
Issue
3
Pages
3132-3158
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2931388211
Cited by
2,230
References
5
FWCI
166.01
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: dynesty: a dynamic nested sampling package for estimating Bayesian posteriors and evidences. https://app.cochat.ai/papers/10.1093/mnras/staa278
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Speagle, J. S. (2020). dynesty: a dynamic nested sampling package for estimating Bayesian posteriors and evidences. Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1093/mnras/staa278

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