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Development of more sophisticated techniques for modeling longitudinal data has implications for improving our understanding of migration. This paper uses longitudinal data from the British Social Change and Economic Life initiative to disentangle the effects of population heterogeneity, progress through the life cycle and secular change on observed migration differentials. The data consist of retrospective life histories from people sampled in several contrasting localities in Great Britain, in which residential moves can be linked to changes in occupation and household structure. We present a framework for analysis of data of this type using a generalized linear modeling approach, together with results concerning variations in the probability of migration with age, gender, and changes in household and occupational circumstances. Of particular note is the evidence of substantial duration-of-residence effects and an unexpected later-career increase in migration propensity. 相似文献
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The Analysis of Spatial Association by Use of Distance Statistics 总被引:20,自引:0,他引:20
Introduced in this paper is a family of statistics, G, that can be used as a measure of spatial association in a number of circumstances. The basic statistic is derived, its properties are identified, and its advantages explained. Several of the G statistics make it possible to evaluate the spatial association of a variable within a specified distance of a single point. A comparison is made between a general G statistic and Moran's I for similar hypothetical and empirical conditions. The empirical work includes studies of sudden infant death syndrome by county in North Carolina and dwelling unit prices in metropolitan San Diego by zip-code districts. Results indicate that G statistics should be used in conjunction with I in order to identify characteristics of patterns not revealed by the I statistic alone and, specifically, the Gi and Gi* statistics enable us to detect local “pockets” of dependence that may not show up when using global statistics. 相似文献
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This collection translates some of the work of the influential Black Brazilian thinker and activist Beatriz Nascimento (1942–1995) for the first time into English, in collaboration with her only daughter, Bethânia Gomes. Historian, poet, theorist and organiser, Beatriz Nascimento was a key figure in Brazil’s Black Movement until her untimely death in 1995. She dangerously wrote at the height of Brazil’s Military Dictatorship (1964–1985), and theorised extensively on the Black condition in Brazil; the unique experience of Black women; and quilombos—Brazilian maroon societies that she imagined as spaces of both historical and contemporary fugitivity. Following Alex Ratts, this introduction outlines her contribution to radical geography, in particular Black geographies, territoriality and embodiment. It also positions Nascimento within the trans‐Atlantic Black radical tradition. We present two of Nascimento’s essays in translation here. The first, “The Concept of Quilombo and Black Cultural Resistance”, introduces a crucial strand of her scholarly work, on the history and socio‐political significance of quilombos (maroon communities). The second, “For a (New) Existential and Physical Territory”, shows Nascimento in a different mood: philosophical, reflective and iconoclastic. In addition, two of her poems—“Dream” and “Sun and Blue”—are also translated here for the first time. 相似文献
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