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Two Solutions to Galton's Problem
Published online by Cambridge University Press: 14 March 2022
Abstract
Two solutions are offered to the problem of distinguishing “historical” from “functional” associations in cross-cultural surveys. The underlying logic of the mathematical model is discussed and three kinds of association distinguished: hyperdiffusional or purely “historical” association, undiffusional or purely “functional” association, and semidiffusional or mixed “historical-functional” association. Two overland diffusion arcs constitute the test sample; the relationship of social stratification to political complexity constitutes the test problem. A sifting test establishes a bimodal distribution of interval lengths between like types and sifts out repetitions with a lesser interval length than the second mode. A cluster test shows that for the test problem, the “hits” cluster more than the “misses”.
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- Copyright © Philosophy of Science Association 1961
References
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19 Ibid.
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23 U. S. Air Force navigation and planning charts, 1:5,000,000, Lambert Conformai Conic Projection; two series of these were used, as available, the AP series and the GNC series. Great circle routes were worked out through the use of the Great Circle Sailing Charts of the U. S. Hydrographic Office; these furnish convenient gnomonic projections which can be applied to any land area simply by substituting any convenient meridian of longitude for the central meridian of the chart and relabeling the other meridians accordingly.
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25 Mosteller and Bush, op. cit., pp. 315-7; Colin White, “The Use of Ranks in a Test of Significance for Comparing Two Treatments,” Biometrics, 8 (1952) 33-41, gives tables at two-sided .05, .01 and .001 significance levels for N = 30 and provides an empirical check on the closeness of the normal approximation and an alternative method of extending his tables.
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