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A spatial gradient without a radial signature: a county-level test of the Younger Dryas impact hypothesis demographic prediction in PIDBA (analysis code and data)

paper
Younger Dryas impacts — title watchElliot AllanApril 17, 2026
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Science & psychologySpeculative history & mysteries

Analysis scripts and computed outputs for the manuscript 'A spatial gradient without a radial signature: a county-level test of the Younger Dryas impact hypothesis demographic prediction in PIDBA' (submitted to the Journal of Archaeological Science: Reports). Includes the original May 2026 analysis scripts (test specifications and decision thresholds fixed in code, git-timestamped 2026-05-26) and the August 2026 subsequent robustness analyses (summed fluted-point denominator, PIDBA August 2026 release, and the spatial-shape falsification battery). The primary result: a robust spatial gradient

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