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191.
Sandeep Mishra Martin L. Lalumière Michael Morgan Robert J. Williams 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2011,27(3):409-426
Problem gambling is significantly more prevalent in forensic populations than in the general population. Although some previous
work suggests that gambling and antisocial behavior are related, the extent and nature of this relationship is unclear. Both
gambling and antisocial behavior are forms of risk-taking, and may therefore share common determinants. We investigated whether
individual differences in personality traits associated with risk-taking, the Big Five personality traits, and antisocial
tendencies predicted gambling and antisocial behavior among 180 male students recruited for a study of gambling (35.0% non-problem
gamblers, 36.7% low-risk gamblers, 21.7% problem gamblers, and 6.7% pathological gamblers). All forms of gambling and antisocial
behavior were significantly correlated. Personality traits associated with risk-acceptance explained a significant portion
of the variance in problem gambling, general gambling involvement, and all forms of antisocial behavior. Antisocial tendencies
(aggression and psychopathic tendencies) explained a significant portion of additional variance in severe antisocial behavior
but not moderate or minor antisocial behavior. When controlling for personality traits associated with risk-acceptance, the
relationship between gambling and antisocial behavior was greatly diminished. The results are consistent with the hypothesis
that gambling and antisocial behavior are associated because they are, in part, different manifestations of similar personality
traits. 相似文献
192.
Service robotics: do you know your new companion? Framing an interdisciplinary technology assessment
Decker M Dillmann R Dreier T Fischer M Gutmann M Ott I Spiecker Genannt D?hmann I 《Poiesis & praxis》2011,8(1):25-44
Service-Robotic—mainly defined as “non-industrial robotics”—is identified as the next economical success story to be expected
after robots have been ubiquitously implemented into industrial production lines. Under the heading of service-robotic, we
found a widespread area of applications reaching from robotics in agriculture and in the public transportation system to service
robots applied in private homes. We propose for our interdisciplinary perspective of technology assessment to take the human
user/worker as common focus. In some cases, the user/worker is the effective subject acting by means of and in cooperation
with a service robot; in other cases, the user/worker might become a pure object of the respective robotic system, for example,
as a patient in a hospital. In this paper, we present a comprehensive interdisciplinary framework, which allows us to scrutinize
some of the most relevant applications of service robotics; we propose to combine technical, economical, legal, philosophical/ethical,
and psychological perspectives in order to design a thorough and comprehensive expert-based technology assessment. This allows
us to understand the potentials as well as the limits and even the threats connected with the ongoing and the planned implementation
of service robots into human lifeworld—particularly of those technical systems displaying increasing grades of autonomy. 相似文献
193.
The call for greater relevance in management research leads us to examine the remedies offered by organization theory to organizational problems. In contrast to Starkey and Madan (2001), we argue that research engagement with other academic disciplines helps produce broadly useful knowledge. Installing practitioners in central places in the research process may focus research on short-run rather than deep-seated processes. We illustrate the relevance of organization theory through two examples of how apparently esoteric knowledge (produced through cross-disciplinary collaboration) can have surprising application. First we show how the social network perspective proved useful in rescuing a manager from the perils of unpopularity. Second, we show how deconstruction can uncover the institutionalized routines that disempower managers and workers. Neither the management training centers nor the web-based learning initiatives admired by Starkey and Madan are likely to deliver insights that address deep-seated processes of change within society. Collaboration with academics across the university can further our goals of research relevant to practitioners. 相似文献
194.
Zonghao Gu George L. Nemhauser Martin W.P. Savelsbergh 《Journal of Combinatorial Optimization》2000,4(1):109-129
We investigate lifting, i.e., the process of taking a valid inequality for a polyhedron and extending it to a valid inequality in a higher dimensional space. Lifting is usually applied sequentially, that is, variables in a set are lifted one after the other. This may be computationally unattractive since it involves the solution of an optimization problem to compute a lifting coefficient for each variable. To relieve this computational burden, we study sequence independent lifting, which only involves the solution of one optimization problem. We show that if a certain lifting function is superadditive, then the lifting coefficients are independent of the lifting sequence. We introduce the idea of valid superadditive lifting functions to obtain good aproximations to maximum lifting. We apply these results to strengthen Balas' lifting theorem for cover inequalities and to produce lifted flow cover inequalities for a single node flow problem. 相似文献
195.
Three procedures for testing the adequacy of a proposed linear multiresponse regression model against unspecified general alternatives are considered. The model has an error structure with a matrix normal distribution which allows the vector of responses for a particular run to have an unknown covariance matrix while the responses for different runs are uncorrelated. Furthermore, each response variable may be modeled by a separate design matrix. Multivariate statistics corresponding to the classical univariate lack of fit and pure error sums of squares are defined and used to determine the multivariate lack of fit tests. A simulation study was performed to compare the power functions of the test procedures in the case of replication. Generalizations of the tests for the case in which there are no independent replicates on all responses are also presented. 相似文献
196.
Michael A. Martin 《Revue canadienne de statistique》1990,18(2):149-153
We show that the jackknife technique fails badly when applied to the problem of estimating the variance of a sample quantile. When viewed as a point estimator, the jackknife estimator is known to be inconsistent. We show that the ratio of the jackknife variance estimate to the true variance has an asymptotic Weibull distribution with parameters 1 and 1/2. We also show that if the jackknife variance estimate is used to Studentize the sample quantile, the asymptotic distribution of the resulting Studentized statistic is markedly nonnormal, having infinite mean. This result is in stark contrast with that obtained in simpler problems, such as that of constructing confidence intervals for a mean, where the jackknife-Studentized statistic has an asymptotic standard normal distribution. 相似文献
197.
198.
199.
Martin Eiliv Sandbu 《Social Choice and Welfare》2008,31(4):589-619
Much work in social choice theory takes individual preferences as uninvestigated inputs into aggregation functions designed
to reflect considerations of fairness. Advances in experimental and behavioural economics show that fairness can also be an
important motivation in the preferences of individuals themselves. A proper characterisation of how fairness concerns enter
such preferences can enrich the informational basis of many social choice exercises. This paper proposes axiomatic foundations
for individual fairness-motivated preferences that cover most of the models developed to rationalise observed behaviour in
experiments. These models fall into two classes: Outcome-based models, which see preferences as defined only over distributive
outcomes, and context-dependent models, which allow rankings over distributive outcomes to change systematically with non-outcome
factors. I accommodate outcome-based and context-sensitive fairness concerns by modelling fairness-motivated preferences as
a reference-dependent preference structure. I first present a set of axioms and two theorems that generate commonly used outcome-based models as special cases. I then
generalise the axiomatic basis to allow for reference-dependence, and derive a simple functional form in which the weight
on each person’s payoff depends on a reference vector of how much each person deserves. 相似文献
200.
Economics starts with the observation of widespread scarcity and the consequent need for choices about resource allocation. Common criteria for such choices are economy, effectiveness, efficiency and equity. This paper defines these criteria and locates them within a conceptual framework (the ‘production of welfare’). It also examines some of the reasons for the growth in interest in them. The main modes of evaluation—cost-benefit, cost-effectiveness, cost-utility and cost-consequences analyses—are described and illustrated. Few such evaluations have been conducted in child care, and the paper ends with speculation as to why this is so. 相似文献