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Accurate age estimation in small-scale societies

Diekmann, Y; Smith, D; Gerbault, P; Dyble, M; Page, AE; Chaudhary, N; Migliano, AB; (2017) Accurate age estimation in small-scale societies. PNAS - Proceedings of the National Academy of Sciences 10.1073/pnas.1619583114. (In press). Green open access

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Abstract

Precise estimation of age is essential in evolutionary anthropology, especially to infer population age structures and understand the evolution of human life history diversity. However, in small-scale societies, such as hunter-gatherer populations, time is often not referred to in calendar years, and accurate age estimation remains a challenge. We address this issue by proposing a Bayesian approach that accounts for age uncertainty inherent to fieldwork data. We developed a Gibbs sampling Markov chain Monte Carlo algorithm that produces posterior distributions of ages for each individual, based on a ranking order of individuals from youngest to oldest and age ranges for each individual. We first validate our method on 65 Agta foragers from the Philippines with known ages, and show that our method generates age estimations that are superior to previously published regression-based approaches. We then use data on 587 Agta collected during recent fieldwork to demonstrate how multiple partial age ranks coming from multiple camps of hunter-gatherers can be integrated. Finally, we exemplify how the distributions generated by our method can be used to estimate important demographic parameters in small-scale societies: here, age-specific fertility patterns. Our flexible Bayesian approach will be especially useful to improve cross-cultural life history datasets for small-scale societies for which reliable age records are difficult to acquire.

Type: Article
Title: Accurate age estimation in small-scale societies
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1073/pnas.1619583114
Publisher version: http://dx.doi.org/10.1073/pnas.1619583114
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Bayesian age estimation, Gibbs sampler, fertility, hunter-gatherers, life history
UCL classification: UCL > School of Life and Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > School of Life and Medical Sciences > Faculty of Life Sciences > Biosciences (Division of) > Genetics, Evolution and Environment
URI: http://discovery.ucl.ac.uk/id/eprint/1563768
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