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	Contextual Seriation	Frequency Seriation
Odbor	Archeológia	Archeológia
Rodina	Process / pipeline	Process / pipeline
Rok vzniku	1899	1962
Tvorca	W. M. F. Petrie (sequence dating); formalized as occurrence seriation by mid-20th-century quantitative archaeologists	Leslie Spier; James A. Ford (developed from W. M. F. Petrie's sequence dating)
Typ	Relative-chronology ordering of units by presence-absence of types	Relative-chronology ordering of assemblages by type proportions
Pôvodný zdroj	Lyman, R. L., & O'Brien, M. J. (2006). Measuring Time with Artifacts: A History of Methods in American Archaeology. University of Nebraska Press. ISBN: 9780803280526	Lyman, R. L., & O'Brien, M. J. (2006). Measuring Time with Artifacts: A History of Methods in American Archaeology. University of Nebraska Press. ISBN: 9780803280526
Ďalšie názvy	Occurrence Seriation, Sequence Dating, Incidence Seriation	Frequency Seriation Dating, Battleship-Curve Seriation, Proportional Seriation
Príbuzné	3	3
Zhrnutie	Contextual seriation, also called occurrence or sequence seriation, is a relative-dating method that orders discrete archaeological units — typically graves or closed deposits — using only the presence or absence of artifact types within them. Its logic is the lifespan assumption: each type is introduced, used continuously for some span, and then disappears, so the contexts in which a type occurs should form an unbroken stretch of the sequence. By permuting the rows and columns of a presence-absence matrix until every type's occurrences cluster into a single contiguous block, the analyst recovers a one-dimensional ordering interpreted as time. The technique originates with W. M. F. Petrie's sequence dating of Egyptian predynastic graves and remains a standard tool for chronology where only incidence data, not abundances, are available.	Frequency seriation is a relative-dating technique that orders archaeological assemblages in time by the changing proportions of the artifact types they contain. Its premise is that any cultural type is introduced, gradually becomes popular, peaks, and then declines, so that the relative frequency of a type traces a single rise-and-fall curve through time. By rearranging the rows of a type-by-assemblage abundance table until every type's frequency forms one continuous unimodal sequence, the analyst recovers an ordering interpreted as chronological. Drawn as horizontal bars, these curves take the lens or 'battleship' shape that gives the method its popular name. Frequency seriation grew out of W. M. F. Petrie's sequence dating and was formalized for proportional data by mid-twentieth-century Americanists such as James A. Ford, becoming a backbone of culture-historical chronology before absolute dating was widely available.