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Log-ratio compositional data analysis in archaeometry

Baxter, MJ; Freestone, IC; (2006) Log-ratio compositional data analysis in archaeometry. ARCHAEOMETRY , 48 511 - 531.

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Abstract

Compositional data arise commonly in archaeometry, in the study of artefact compositions where the variables measured either sum to 100%, or can be viewed as a subset of such a set of variables. There has been debate in Archaeometry about the appropriate way to analyse such data statistically, which amounts to argument about how the data should be transformed prior to statistical analysis. This paper reviews aspects of the debate and illustrates, using both simulated and real data, that what has been proposed as the 'correct' theoretical approach-log-ratio analysis-does not always work well. The reasons for this are discussed.

Type:Article
Title:Log-ratio compositional data analysis in archaeometry
Keywords:glass, chemical composition, log-ratio analysis, principal component analysis, MULTIVARIATE-ANALYSIS, MYCENAEAN POTTERY, CERAMICS, GLASS
UCL classification:UCL > School of Arts and Social Sciences > Faculty of Social and Historical Sciences > Institute of Archaeology

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