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Journal ArticleDOI

Recent and Planned Developments of the Program OxCal

Christopher Bronk Ramsey, +1 more
- 09 May 2013 - 
- Vol. 55, Iss: 2, pp 720-730
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TLDR
The recent additions to the statistical methods of OxCal are primarily aimed at providing more robust models, in particular through model averaging for deposition models and through different multiphase models.
Abstract
OxCal is a widely used software package for the calibration of radiocarbon dates and the statistical analysis of 14 C and other chronological information. The program aims to make statistical methods easily available to researchers and students working in a range of different disciplines. This paper will look at the recent and planned developments of the package. The recent additions to the statistical methods are primarily aimed at providing more robust models, in particular through model averaging for deposition models and through different multiphase models. The paper will look at how these new models have been implemented and explore the implications for researchers who might benefit from their use. In addition, a new approach to the evaluation of marine reservoir offsets will be presented. As the quantity and complexity of chronological data increase, it is also important to have efficient methods for the visualization of such extensive data sets and methods for the presentation of spatial and geographical data embedded within planned future versions of OxCal will also be discussed. DOI:  10.2458/azu_js_rc.55.16215

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Journal ArticleDOI

Methods for Summarizing Radiocarbon Datasets

TL;DR: Three different approaches are compared: “Sum” distributions, postulated undated events, and kernel density approaches and their suitability for visualizing the results from chronological and geographic analyses considered for cases with and without useful prior information.
Journal ArticleDOI

The genetic history of Ice Age Europe

Qiaomei Fu, +76 more
- 09 Jun 2016 - 
TL;DR: In this article, the authors analyse genome-wide data from 51 Eurasians from ~45,000-7,000 years ago and find that the proportion of Neanderthal DNA decreased from 3-6% to around 2%, consistent with natural selection against Neanderthal variants in modern humans.
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Strong and deep Atlantic meridional overturning circulation during the last glacial cycle

TL;DR: It is shown that a deep and vigorous overturning circulation mode has persisted for most of the last glacial cycle, dominating ocean circulation in the Atlantic, whereas a shallower glacial mode with southern-sourced waters filling the deep western North Atlantic prevailed during glacial maxima.
References
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Journal ArticleDOI

Bayesian analysis of radiocarbon dates

TL;DR: An overview of the main model components used in chronological analysis, their mathematical formulation, and examples of how such analyses can be performed using the latest version of the OxCal software (v4) are given.
Journal ArticleDOI

Radiocarbon Calibration and Analysis of Stratigraphy: The OxCal Program

TL;DR: In this article, the OxCal program informatique OxCal permet d'effectuer de nombreuses analyses sur les dates radiocarbones, de la simple calibration a l'analyse de tous les sites archeologiques en donnant des informations sur la stratigraphie and les autres methodes de datation.
Journal ArticleDOI

Development of the radiocarbon calibration program

TL;DR: This paper highlights some of the main developments to the radiocarbon calibration program, OxCal, including changes to the sampling algorithms used which improve the convergence of the Bayesian analysis.
Journal ArticleDOI

Deposition models for chronological records

TL;DR: In this paper, a range of Bayesian models for deposition which have been implemented in the computer program OxCal are presented. But these models can be used to combine information from the sediments themselves with radiocarbon or other direct dating information.
Journal ArticleDOI

Dealing with outliers and offsets in radiocarbon dating

TL;DR: The use of a similar approach for other kinds of correlated offset (such as overall measurement bias or regional offsets in the calibration curve) is discussed and the implementation of these methods in OxCal v 4.0 is presented.
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