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11.
Objectives
A large body of literature in quantitative criminology finds that the spatio-temporal clustering of burglary is greater than one would expect from chance alone. This suggests that such crimes may exhibit a “boost” effect, wherein each burglary increases the risk to nearby locations for a short period. In this study, we demonstrate that standard tests for spatio-temporal dependence have difficulty distinguishing between clustering caused by contagion and that caused by changing relative risks. Therefore, any estimates of the boost effect drawn from these tests alone will be upwardly biased.Methods
We construct an agent-based model to generate simulated burglary data, and explore whether the Knox test can reliably distinguish between contagion (one burglary increases the likelihood of another burglary nearby) and changes in risk (one area gets safer while another gets more dangerous). Incorporating insights from this exercise, we analyze a decade of data on burglary events from Washington, DC.Results
We find that (1) absent contagion, exogenous changes in relative risk can be sufficient to produce statistically significant Knox ratios, (2) if risk is changing over time, estimated Knox ratios are sensitive to one’s choice of time window, and (3) Knox ratios estimated from Washington, DC burglary data are sensitive to one’s choice of time window, suggesting that long-run changes in relative risk are, in part, driving empirical estimates of burglary’s boost effect.Conclusions
Researchers testing for contagion in empirical time series should take precautions to distinguish true contagion from exogenous changes in relative risks. Adjusting the time window of analysis is a useful robustness check, and future studies should be supplemented with new approaches like agent-based modeling or spatial econometric methods.12.
Elizabeth M. Hammond Melissa A. Berry Dario N. Rodriguez 《Legal and Criminological Psychology》2011,16(2):242-252
Purpose. The purpose of this study was to examine the influence of rape myth acceptance, belief in a just world, and sexual attitudes on attributions of responsibility in a date rape scenario. We predicted that people higher in rape myth acceptance and those who more strongly believed in a just world, as well as those who held more conservative sexual attitudes, would attribute greater blame to the accuser than to the accused. Methods. One hundred seventy‐two undergraduates from a medium‐sized, Catholic university in the USA read a hypothetical date rape scenario and completed the Rape Myth Acceptance Scale, the Just World Scale, the Sexual Attitudes Scale, and a Judgment Questionnaire constructed for the current study. Results. Rape myth acceptance mediated the relationship between gender and judgments of responsibility for the accused and the accuser. Men were more likely to endorse rape myths and, consequently, assign less responsibility to the accused and more responsibility to the accuser than women. Conclusions. Pre‐existing beliefs regarding the nature of rape and the circumstances surrounding it may bias attributions of responsibility in date rape cases. There may be utility in addressing whether jurors hold such beliefs prior to the start of a trial. 相似文献
13.
14.
Ayla Hammond Schbley 《冲突和恐怖主义研究》2013,36(4):213-247
Abstract This study introduces the concept of geocultural immobility. A minority's geocultural immobility is identified as an imposed low geographic mobility within a nation with low cultural pluralism. It establishes the Lebanese Shi'a geocultural immobility, to which it attributes their religious resurgence. This Lebanese Shi'a religious resurgence is proven in this research to produce the zealots needed by religious terrorist organizations. This study also introduces and defines religious terrorism as violent acts performed by elements of religious organizations or sects, growing out of a commitment to communicate a divine message. It makes distinctions among religious terrorism, secular terrorism, and fighters for religious freedom, which are based on the actors' motives, affinities, and consciousness of the maliciousness of their acts. The primary and secondary data and the quasiexperiment in this research support its special hypotheses. They indicate a statistical correlation between eight Lebanese Shi ‘a cultural and religious attributes. 相似文献
15.
David Canter Laura Hammond Donna Youngs Piotr Juszczak 《Journal of Quantitative Criminology》2013,29(3):423-446
Objectives
Current ‘geographical offender profiling’ methods that predict an offender’s base location from information about where he commits his crimes have been limited by being based on aggregate distributions across a number of offenders, restricting their responsiveness to variations between individuals as well as the possibility of axially distorted distributions. The efficacy of five ideographic models (derived only from individual crime series) was therefore tested.Methods
A dataset of 63 burglary series from the UK was analysed using five different ideographic models to make predictions of the likely location of an offenders home/base: (1) a Gaussian-based density analysis (kernel density estimation); (2) a regression-based analysis; (3) an application of the ‘Circle Hypothesis’; (4) a mixed Gaussian method; and (5) a Minimum Spanning Tree (MST) analysis. These tests were carried out by incorporating the models into a new version of the widely utilised Dragnet geographical profiling system DragNetP. The efficacy of the models was determined using both distance and area measures.Results
Results were compared between the different models and with previously reported findings employing nomothetic algorithms, Bayesian approaches and human judges. Overall the ideographic models performed better than alternate strategies and human judges. Each model was optimal for some crime series, no one model producing the best results for all series.Conclusions
Although restricted to one limited sample the current study does show that these offenders vary considerably in the spatial distribution of offence location choice. This points to important differences between offenders in the morphology of their crime location choice. Mathematical models therefore need to take this into account. Such models, which do not draw on any aggregate distributions, will improve geographically based investigative decision support systems. 相似文献16.
17.
Violence is a critical cause of death and nonfatal injuries among youth, and even those who witness violence can suffer serious health and mental health consequences. This highlights the need for prevention programs and policies aimed at reducing risks, promoting prosocial behavior, strengthening families, and creating communities in which youth are safe from violence. The Centers for Disease Control and Prevention's Injury Center is developing a National Public Health Strategy to Prevent Youth Violence. The strategy will establish a full application of the public health approach, ranging from research to practice. It also spotlights what is working, as a way to mobilize community leaders in supporting evidence-based initiatives. With the empirical guidance of articles such as those in this special issue, a shared strategy to prevent youth violence will help focus efforts and resources on solutions that show the most promise, and ensure that American communities undertake more comprehensive and coordinated prevention efforts to protect our nation's youth. 相似文献
18.
This paper examines the extent to which organizational hierarchies are democratic or (in the more usual language of administrative studies) participative, in the sense that the views of a large proportion of organizational membership are taken into account when an organizational choice is made. We view organizations as making choices in a “bottom-up” manner: subordinates recommend options to their superior, and if subordinates are in sufficient agreement their superior accepts their advice. We prove that as the number of levels in the hierarchy increases, organizational choices can be dominated by a smaller and smaller proportion of the total organizational membership. In the limit, a vanishing small proportion of the membership can dominate policymaking. 相似文献
19.
Thomas H. Hammond 《Public Choice》2007,133(3-4):359-375
The scoring method used by high schools and colleges in the U.S. to determine which team wins a cross-country meet can violate a major social choice principle, referred to here as Independence from Irrelevant Teams: whether team A is scored as defeating or losing to team B can depend on whether team C’s performance is included in the calculations. In addition, if a three-way meet is scored as three dual meets, the scoring method can produce a cycle, thereby violating the principle of Transitivity: team A beats team B, team B beats team C, but team C beats team A. Real-world violations of Independence and Transitivity are reported from a high school cross-country meet held in Michigan in the U.S. in 2003. Several results are presented about the conditions under which these two principles can be violated. An alternative scoring method that will violate neither Independence nor Transitivity is also discussed and evaluated. 相似文献
20.