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Timothy K. Perttula 《Journal of Archaeological Research》1996,4(4):295-348
This paper summarizes recent archaeological research efforts, and changing perspectives, about the native history of the Caddo peoples who lived in the Caddoan Archaeological Area, which centers on the Great Bend of the Red River in Oklahoma, Texas, Arkansas, and Louisiana. Of particular focus are the origins and early developments of the Caddoan tradition, regional diversity, subsistence changes and agricultural intensification, sociopolitical dynamics, and Caddoan-European interaction. 相似文献
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SPATIAL DEPENDENCY OF SEGREGATION INDICES 总被引:3,自引:0,他引:3
David W.S. Wong 《The Canadian geographer》1997,41(2):128-136
A few researchers have mentioned the scale sensitivity of segregation index, D. In this paper, I discuss analytically and empirically why using large enumeration areal units usually results in low segregation measures, and using small areal units produces relatively high segregation measures. The discussion is also applicable to the multi-group variant of D. A major finding is that if people of the same ethnic groups are positively spatially auto-correlated, increasing the size of areal units of analysis may not lower D initially, because only people of the same group are added. But enlarging the areal units subsequently may include population of other ethnic groups, and therefore could lower D. However, if the boundaries of the larger enumeration units are drawn to include only population of the same group, then D will not change significantly. Both the spatial autocorrelation of ethnic group population and zonal pattern are critical factors in determining the scale sensitivity of D. 相似文献
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Timothy M. 《政策研究杂志》1982,10(3):499-522
During the 1970's several policy analysts developed estimates of the effect of in-kind transfers (e.g., Food Stamps and Medicaid) on poverty. Unfortunately, many of these studies have, drastically overstated the antipoverty impact of in-kind transfers, leading some to claim that there are no mart? poor people in America. This article reviews these, studies, provides new evidence on the impact of in-kind benefits on poverty, and concludes that there is still a substantial poverty problem in America today which need be addressed by policymakers. 相似文献