Dealing with outliers and offsets in radiocarbon dating
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Wheat is regarded as one of the most important West Asian domesticates that were introduced into Late Neolithic/Early Bronze Age China.
Despite a growing body of archaeological data, the timing and routes of its dispersal remain controversial. These results neither support long-standing hypotheses of a progressive spread of wheat agriculture from Xinjiang or Gansu to eastern China nor suggest a nearly synchronous appearance in this vast zone, but corroborate transmission to lower Yellow River elites as an exotic good through cultural interactions with the Eurasian steppe along north–south routes. 1: Topographical maps showing the archaeological sites from China with directly dated wheat remains contained in the compiled data set and potential dispersal routes of wheat into and within China.
In particular, there is an assumption that all of the radiocarbon measurements are correct in their context and that the original radiocarbon concentration of the sample is properly represented by the calibration curve.
In practice in any analysis of dates some are usually rejected as obvious outliers.