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Evaluating Bayesian Radiocarbon‐dated Event Count (REC) models for the study of long‐term human and environmental processes

W. Christopher Carleton
Journal of Quaternary Science · Vol. 36, Issue 1 · pp. 110-123 · 2021

Abstract

Chronological uncertainty complicates attempts to use radiocarbon dates as proxies for processes such as human population growth/decline, forest fires and marine ingression. Established approaches involve turning databases of radiocarbon‐date densities into single summary proxies that cannot fully account for chronological uncertainty. Here, I use simulated data to explore an alternative Bayesian approach that instead models the data as what they are, namely radiocarbon‐dated event counts. The approach involves assessing possible event‐count sequences by sampling radiocarbon date densities and then applying a Markov Chain Monte Carlo method to estimate the parameters of an appropriate count‐based regression model. The regressions based on individual sampled sequences were placed in a multilevel framework, which allowed for the estimation of hyperparameters that account for chronological uncertainty in individual event times. Two processes were used to produce simulated data. One represented a simple monotonic change in event‐counts and the other was based on a real palaeoclimate proxy record. In both cases, the method produced estimates that had the correct sign and were consistently biased towards zero. These results indicate that the approach is widely applicable and could form the basis of a new class of quantitative models for use in exploring long‐term human and environmental processes.

Bibliographic Information

JournalJournal of Quaternary Science
PublisherWiley
Publication Date2021-01-01
Publication Year2021
Volume36
Issue1
Pages110-123
Document TypeJournal Article
Print ISSN0267-8179
eISSN1099-1417
DOI10.1002/jqs.3256
SubjectEarth & Environmental Science

Access Information

NARA Access Coverage1996-01-01~Current
Journal Homepagehttps://onlinelibrary.wiley.com/loi/10991417
Publisher PageOpen Publisher Page
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