Structure and inferences

As compositional analysis has become more routine in archaeological investigations, deficiencies in the numerical techniques used for data reduction and summary have become more apparent. A brief overview of techniques commonly used in the analysis of compositional data is presented as well as an example illustrating how data modeling (as opposed to data summary) can facilitate both the recognition of relevant data structure and inferences from data structure to underlying natural and cultural processes. 

As explained thoroughly in the original report, by careful comparison of the frequencies of these core-size markers with a series of structurally well-defined model compounds, the authors concluded that the photoproduct has a slightly expanded core relative to the deoxy structure and inferred that the probable cause for this expansion is restriction of the out-of-plane displacement of the iron brought about by protein restraint on the proximal histidine. Given this interpretation, it should be expected that significant differences in the iron-histidine stretching frequency are likely to be observed, and, as will be seen, it is indeed this feature which exhibits the most substantial shifts for these intermediate species. 

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