Salīdzināt metodes

	Frequency Seriation	Harris Matrix	Radiocarbon Calibration
Nozare	Arheoloģija	Arheoloģija	Arheoloģija
Saime	Process / pipeline	Process / pipeline	Process / pipeline
Izcelsmes gads	1962	1973	2020
Autors	Leslie Spier; James A. Ford (developed from W. M. F. Petrie's sequence dating)	Edward C. Harris (with the Winchester excavation team)	Hans Suess (first curves); IntCal Working Group (P. J. Reimer et al.)
Tips	Relative-chronology ordering of assemblages by type proportions	Stratigraphic recording and sequence-diagramming pipeline	Probabilistic conversion of radiocarbon ages to calendar ages
Pirmavots	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	Harris, E. C. (1989). Principles of Archaeological Stratigraphy (2nd ed.). Academic Press. ISBN: 9780123266514	Reimer, P. J., et al. (2020). The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0-55 cal kBP). Radiocarbon, 62(4), 725-757.
Citi nosaukumi	Frequency Seriation Dating, Battleship-Curve Seriation, Proportional Seriation	Stratigraphic Sequence Diagram, Harris-Winchester Matrix, Single-Context Recording, Context Sequence Diagram	14C Calibration, IntCal Calibration, Calendar Calibration of Radiocarbon Dates
Saistītās	3	2	3
Kopsavilkums	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.	The Harris matrix is a method for recording and diagramming the stratigraphic sequence of an archaeological site as a partial-order diagram of individually defined contexts. Devised by Edward C. Harris at the Winchester excavations in 1973 and codified in his Principles of Archaeological Stratigraphy, it treats every deposit, cut, and interface as a separate stratigraphic unit and reduces the tangle of physical relationships among them to a minimal directed acyclic graph that expresses only relative temporal order. By distinguishing physical superposition from temporal sequence and stripping away redundant relationships through transitive reduction, the matrix turns the three-dimensional complexity of a dig into a single, auditable diagram. It is the structural backbone of single-context recording and the standard interface between excavation and chronological modeling.	Radiocarbon calibration converts a laboratory radiocarbon measurement into a probability distribution over actual calendar years. It is necessary because the assumptions behind a raw radiocarbon age are not exactly true: the concentration of carbon-14 in the atmosphere has varied over time, so a measured radiocarbon age does not equal a calendar age. Calibration corrects for this by comparing the measurement against an internationally agreed curve — currently IntCal20 — that records the relationship between radiocarbon age and calendar age, reconstructed from precisely dated tree rings, corals, speleothems, and other archives. Because the curve wiggles, calibration typically yields an irregular, sometimes multi-peaked range of calendar years rather than a single date, and that range is the proper expression of a radiocarbon result.