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The following address was given by Dr. Shannon at a joint meetingof the Royal Empire Society on July 4, 1957. Lord Hailey, Chairmanof the Royal African Society, presided. 相似文献
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JEFFERY A. JENKINS MICHAEL H. CRESPIN JAMIE L. CARSON 《Legislative Studies Quarterly》2005,30(3):365-389
We examine the degree to which parties act as procedural coalitions in Congress by testing predictions from the party cartel theory (Cox and McCubbins 1993, 1994, 2002). We gain leverage on the question of party influence in Congress by focusing on three types of House members: reelection seekers, higher‐office seekers, and retiring members. We argue that retiring House members are no longer susceptible to party pressure, making them the perfect means (when compared to higher‐office seekers and reelection seekers) to determine the existence of party influence. Results from a pooled, cross‐sectional analysis of the 94th through 105th Congresses (1975–98) suggest that party influence is indeed present in Congress, especially where the party cartel theory predicts: on procedural, rather than final‐passage, votes. Moreover, we find that procedural party influence is almost exclusively the domain of the majority party. This latter finding is especially important because most prior studies have been limited to investigating interparty influence only. 相似文献
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Within any type of system, the actors in the system inevitably compete over resources. With competition comes the possibility of conflict. To minimize such effects, actors often will partition the system into geographic territories. It is against the larger ecological backdrop of competition and conflict that we examine territory formation among urban street gangs. Although previous studies have examined the social and built environment where gangs form, and how the presence of a gang influences local levels of violence, we know little about how competitive interactions are tied to the formation and maintenance of gang territories. We use formal spatial Lotka–Volterra competition models to derive hypotheses about competition‐driven territory formation. By using data on 563 between‐gang shootings, involving 13 rival street gangs in the Hollenbeck Policing Division of Los Angeles, we show that violence strongly clusters along the boundaries between gangs in a way that is quantitatively predicted by the theory. The results suggest that even weak competitive interactions between gangs are sufficient to drive gang territory formation without recourse to other processes or assumptions. 相似文献
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SHANNON JENKINS 《Legislative Studies Quarterly》2006,31(2):235-257
To assess the relative impact of party and ideology on legislative behavior, I utilize survey‐based measures of legislator ideology to examine voting in five state legislatures. The results suggest that, although party and ideology both influence voting, the impact of party is greater. The magnitude of this impact varies, however, from chamber to chamber. The activity of parties in the electoral arena explains part of this variance, with more active parties having more influence. Thus, research on legislative behavior should focus on the context surrounding the decision‐making process in order for us to understand the influences on voting. 相似文献
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Programme Analysis and Review (PAR) was an approach to policy analysis introduced in 1970 by Edward Heaths administration as part of a systematic attempt to develop 'rational' government. In the early years some substantial reviews were completed, but from 1973 the exercise faded as less political commitment was devoted to it and institutional compromise and disillusion spread. This paper charts the life of PAR until its official demise in 1979 and analyses its experience, Above all, it suggests that PAR was unable to satisfy the technical, organizational and political preconditions for effective analysis. 相似文献
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Drawing upon control theory, school climate theory, and social disorganization theory, this study examined the relative influence of individual, institutional, and community factors on misconduct in Philadelphia middle schools. Using U.S. census data, school district data, police department data, and school climate survey data obtained from the administration of the Effective School Battery to 7, 583 students in 11 middle schools, we examined the following predictors of student misconduct: community poverty and residential stability; community crime; school size; student perceptions of school climate (school attachment); and individual student characteristics (e.g., age, race, sex, school involvement and effort, belief in rules, positive peer associations). “Community” was conceptualized in two ways: “local” (the census tract around the school), and “imported” (aggregated measures from the census tracts where students actually lived). We used hierarchical linear modeling techniques (HLM) to examine between- and within-school factors. Individual-level factors accounted for 16% of the explained variance; school and community-level factors (both local and imported) added only small increments (an additional 4.1–4.5%). We conclude that simplistic assumptions that “bad” communities typically produce “bad” children or “bad” schools are unwarranted. 相似文献