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Development and Application of the Trapezoidal Model for Archaeological Chronologies

Published online by Cambridge University Press:  18 July 2016

Sharen Lee*
Affiliation:
Oxford Radiocarbon Accelerator Unit (ORAU), Research Laboratory for Archaeology and the History of Art (RLAHA), University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, United Kingdom
Christopher Bronk Ramsey
Affiliation:
Oxford Radiocarbon Accelerator Unit (ORAU), Research Laboratory for Archaeology and the History of Art (RLAHA), University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, United Kingdom
*
Corresponding author. Email: sharen.lee@rlaha.ox.ac.uk.
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Abstract

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Single- and multiphase models have been used extensively in construction of chronologies. We model more gradual transition between phases with a trapezoid model since it better reflects the nature of the information that goes into the model prior. We find that a simple trapezoid model has a bias that docs not reflect prior knowledge, and thus propose an addition of a noninformative clement to the prior. We also present an alternative parameterization, which transforms the current abrupt transition model into a model that allows for gradual changes. The addition of a noninformative prior ensures model flexibility. We evaluate these Bayesian models using 2 case studies.

Type
Articles
Copyright
Copyright © 2012 by the Arizona Board of Regents on behalf of the University of Arizona 

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