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1.
Measures of Multigroup Segregation 总被引:3,自引:0,他引:3
In this paper we derive and evaluate measures of multigroup segregation. After describing four ways to conceptualize the measurement of multigroup segregation—as the disproportionality in group (e.g., race) proportions across organizational units (e.g., schools or census tracts), as the strength of association between nominal variables indexing group and organizational unit membership, as the ratio of between–unit diversity to total diversity, and as the weighted average of two–group segregation indices—we derive six multigroup segregation indices: a dissimilarity index (D), a Gini index (G), an information theory index (H), a squared coefficient of variation index (C), a relative diversity index (R), and a normalized exposure index (P). We evaluate these six indices against a set of seven desirable properties of segregation indices. We conclude that the information theory index H is the most conceptually and mathematically satisfactory index, since it alone obeys the principle of transfers in the multigroup case. Moreover, H is the only multigroup index that can be decomposed into a sum of between– and within–group components. 相似文献
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Emily S. Minor Christopher W. Appelt Sean Grabiner Lorrie Ward Alexandra Moreno Stephen Pruett-Jones 《Urban Ecosystems》2012,15(4):979-991
Monk parakeets (Myiopsitta monachus) are the most abundant and widely distributed of the naturalized parrots in the United States. Their presence is simultaneously encouraged by some humans (through use of bird feeders) and discouraged by others (through removal of their nests) and, as a result, they show an interesting spatial distribution across urban areas. We used an online public survey and field surveys to examine the influence of human activities and land use on the distribution of this exotic species around Chicago, IL (USA). These efforts resulted in detection of 249 nesting structures and approximately 778 birds across the region. A CART analysis successfully separated nesting sites from random sites and correctly classified 90?% of the nesting sites. The most important factor in the model was land use, with nests typically found in areas with less than 84?% residential zoning. We found nests on a wide variety of substrates including trees, cell phone towers, and stadium lights. Spatial point pattern analysis indicated that nests in trees and nests in built substrates were significantly dissociated with each other at all scales. Nests on built substrates were closer to railroads and highways or in areas with lower human population density, suggesting either a difference in substrate availability or human tolerance between these settings. While humans may have a positive effect on distribution of monk parakeets at large spatial scales, at the scale of this study we see a potentially negative effect of too many humans on the distribution of monk parakeet nests. 相似文献
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Women with female sexual problems (FSP) are more likely than unaffected women to demonstrate negative appraisals, negative affect, and avoidance of sexual activity. Research suggests affected women also experience negative affect and avoidance in response to intimate partner contact for fear it will lead to sex. This online study examined whether women with FSP (N = 157) and without FSP (N = 129) exhibited different perceptions, affective reactions, and behavioral responses to hypothetical touch occurring outside sexual activity. Women (Mage = 30.70; SD = 6.66) were randomly assigned to one of three conditions representing hypothetical interactions with their partner (affectionate, sexual, or no touch), and answered questions about their perceptions of their partner’s sexual intentions and their own anticipated negative affect and behavioral avoidance. Women with FSP reported higher perceptions of sexual intent, negative affect, and avoidance in the sexual touch condition, and higher negative affect in the affectionate touch condition, than women without FSP. Results highlight that women with FSP have more negative reactions to partners’ hypothetical affectionate and sexual touch than women without FSP. Interventions for FSP may benefit from targeting women’s perceptions, affective reactions, and behavioral reactions to partner touch when it occurs outside of explicitly sexual contexts. 相似文献
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AbstractEven though supply chain agility (SCA) has been considered an essential concept in supply chain management (SCM) research, the way it is experienced and manifested, especially by small and medium-sized enterprises (SMEs), has received much less attention. Our purpose is to focus on SME organisational vulnerabilities in the context of increased environmental uncertainty, and explore how SCA is developed and applied by SMEs amid their vulnerabilities. By relying on insights from comparative case studies of three British SMEs, we examine SME SCA as an acclimatisation process and delve into SMEs’ experiences of facing environmental uncertainty while developing and applying SCA. Our findings highlight that organisational attitudes underlie how SMEs perceive environmental uncertainty, tackle organisational vulnerabilities and develop SCA as an acclimatisation process. Our findings also reveal that resource constraints, supply chain relationships, interorganisational power dynamics, and access to information play important roles in developing SCA. 相似文献
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Henriette Lundgren April Bang Sean B. Justice Victoria J. Marsick Rob F. Poell Lyle Yorks 《Human Resource Development International》2017,20(4):305-326
This paper seeks to understand key dimensions of reflection in experience-based workplace learning for research being collaboratively undertaken by scholars in Dutch and US research institutions. We systematically explore and compare Tara Fenwick’s analysis of five perspectives on cognition to distinguish among constructivist, psychoanalytic, situative, critical-cultural, and enactivist perspectives on reflection. Our aim is to examine how to conceptualize reflection so that one or more perspectives can complement our understanding of learning through experience at work. We position reflection not only from a practical but also from a theoretical perspective that moves beyond the individual focus of the constructivist perspective. Fenwick’s five perspectives are described in terms of whether and how reflection is utilized, key activities in the process of reflection, relative focus on the individual and/or the context, triggers for reflection, role of power and positionality, role of emotions, and reflection outcomes. We conclude that adding other lenses to the dominant constructivist perspective helps expand our understanding of reflection as well as identify and attend to other tools, people, and factors in the work situation that influence reflection processes and learning outcomes. The paper closes with a discussion of promising new approaches that have emerged since Fenwick’s analysis. 相似文献
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This article examines the evaluation and legitimization of city‐street video surveillance in Ontario, Canada. We demonstrate how monitoring programs are promoted, designed, and justified based on rhetorical claims about their efficacy. Although program evaluation data do not commonly corroborate or support program objectives, we show how the rhetorical politics of video surveillance evaluation research finds legitimacy by adhering to the Ontario privacy commissioner's best practices guidelines—guidelines that are formulated to minimize rhetoric in system design. The findings raise questions about how city‐street video surveillance remains a viable policy option given the lack of evidence pertaining to its usefulness. 相似文献