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Mark Moritz Britney R. Kyle Kevin C. Nolan Steve Patrick Marnie F. Shaffer Gayatri Thampy 《发展研究杂志》2013,49(7):1113-1133
We examine whether Stephen Sandford's (2006b) ‘too many people, too few livestock’ thesis for the Greater Horn of Africa applies to West Africa. In a comparative study of seven pastoral systems across West Africa we found that pastoralists have generally successfully adapted to pressures on grazing resources. We describe three adaptive strategies: 1) integration and intensification in the Sudanian zone; 2) movement to the Sub-Humid zone; and 3) extensification in the Sahelian zone. We end by proposing four interrelated factors that account for the differences in pastoral systems between West Africa and the Greater Horn of Africa. 相似文献
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Paul Shaffer 《发展研究杂志》2013,49(11):1619-1635
The recent attention afforded to randomisation, or Randomised Control Trials (RCTs), in impact assessment is a welcome development. The case for RCTs in international development, however, has been quite overstated. This article critically examines the seminal model underlying RCTs, the Holland-Rubin Framework, with a view to make four claims about RCTs: (i) they have limitations as conceptions of causation; (ii) their ‘idealised’ model of causal inference is undermined by implementation issues; (iii) they are not necessary to make internally valid statements about impact; and (iv) in general, they do not provide sufficient information for many purposes of impact assessment. The key argument is that ultimately, the choice of approach to impact assessment should be driven by the research question at hand and not by the alleged superiority of method. 相似文献
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Hilary G. Harding Diana Morelen Kristel Thomassin Laura Bradbury Anne Shaffer 《Journal of family violence》2013,28(1):63-72
The current study examined the relationship of maternal- and paternal-perpetrated intimate partner violence (IPV) to children’s internalizing and externalizing symptomatology. Mother-child dyads (N?=?53; child ages 8–11) reported maternal- and paternal-perpetrated IPV exposure and measures of child symptomatology. Results demonstrated that: (a) maternal- and paternal-perpetrated IPV have similar but not identical relations with child outcomes, (b) mothers’ and children’s reports of paternal-perpetrated IPV were positively related, (c) mother and child report of maternal- and paternal-perpetrated IPV related to child emotional and behavior problems, and (d) emotion dysregulation mediated the link between IPV exposure and child outcomes. Notably, findings differed by reporters. Results support emotion dysregulation as one mechanism through which IPV exposure may lead to child behavior problems, with implications for clinical intervention. 相似文献
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Policymakers and other interested stakeholders currently are seeking information about the comparative effectiveness of different regulatory approaches to minimising gambling-related harm. This study responds to this research gap by exploring associations between gambling policies and disordered gambling prevalence rates. We gathered information about gambling policies for thirty European jurisdictions and past-year prevalence rates for disordered gambling for twelve of these jurisdictions. We present policy trends and prevalence rates and then describe the level of association between policy and prevalence. We observe one statistically significant association between policy and prevalence: rates of sub-clinical (i.e., Level 2) disordered gambling were higher within environments that mandated less strict regulation of advertising for online gambling. Finally, we discuss the implications of our research in the context of the current process regarding the pan-European regulation of gambling. Our findings do not offer evidence for certain assumptions made in the past by the European judiciary. 相似文献
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Professor William R. Shaffer 《Political Behavior》1996,18(2):187-218
The purpose of this paper is to offer an explanation as to why Euclidean distance serves as a reasonably good approximation of reality when it does not incorporate explicity a consideration of the sides of the issue taken by the voter and candidate. The empirical evidence indicates quite clearly that Euclidean distance and side of issue are extremely highly correlated. Two general classes of explanation are offered. First, this powerful association can be seen as a function of the mathematical difficulty of actually being in close proximity to a preferred party while being on the opposite side of an issue on a 7-point scale. Second, even after this mathematical artifact is taken into account, the combined effects of assimilation, contrast, and negativity may bring favored candidates closer to the voter and drive the opposition further away, resulting in a strong correlation of Euclidean distance and side of the issue. 相似文献
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William R. Shaffer 《Scandinavian political studies》1991,14(1):59-83
The purpose of this study is to map interparty spatial relationships embedded in non-unanimous roll call votes recorded during the 1985–86 session of the Norwegian parliament. The analysis is theoretically grounded in the one-dimensional Scandinavian five-party model and a two-dimensional model which assumes that the conventional left–right continuum is intersected by an urban protest/rural traditionalism axis. While the one-dimensional solution which arrays the parties along the conventional left–right continuum is statistically defensible, a two-dimensional solution appears better to reflect the reality of contemporary Norwegian politics in which the post-Second World War welfare-state consensus is being challenged by the Progressive Party. The resulting divisions among the non-socialist parties may preclude a stable center-right governing coalition. 相似文献
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