Analysis of Spatial Gradients in Radiocarbon Dates
Filter archaeological site coordinates and dates, retaining only the e...
Interpolate using inverse distance weighting.
Perform regression of dates versus distances from multiple potential o...
Perform regression of archaeological dates on great circle distances f...
Plot a map with the results of the iteration over multiple sites, show...
Plot the results of the regression bootstrap on archaeological dates v...
Extract a single year estimate for ranges of calibrated dates with a p...
Return summary statistics for a dateModel object.
Inspired by space-time regressions often performed to assess the expansion of the Neolithic from the Near East to Europe (Pinhasi et al. 2005 <doi:10.1371/journal.pbio.0030410>). Test for significant correlations between the (earliest) radiocarbon dates of archaeological sites and their respective distances from a hypothetical center of origin. Both ordinary least squares (OLS) and reduced major axis (RMA) methods are supported (Russell et al. 2014 <doi:10.1371/journal.pone.0087854>). It is also possible to iterate over many sites to identify the most likely origin.