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591.
592.
Walter R. Gilks & Carlo Berzuini 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2001,63(1):127-146
Markov chain Monte Carlo (MCMC) sampling is a numerically intensive simulation technique which has greatly improved the practicality of Bayesian inference and prediction. However, MCMC sampling is too slow to be of practical use in problems involving a large number of posterior (target) distributions, as in dynamic modelling and predictive model selection. Alternative simulation techniques for tracking moving target distributions, known as particle filters, which combine importance sampling, importance resampling and MCMC sampling, tend to suffer from a progressive degeneration as the target sequence evolves. We propose a new technique, based on these same simulation methodologies, which does not suffer from this progressive degeneration. 相似文献
593.
Following the Supreme Court's Kodak decision, numerous antitrust cases have revolved around practices of manufacturers which deter independent service organizations (ISOs) from servicing the manufacturer's equipment. Such practices include tying equipment sales to service, tying service sales to other "aftermarket" products, and refusing to sell replacement parts to ISOs. We show that interbrand systems competition without ISOs curbs service and equipment price distortions and, under plausible conditions, confers greater benefits to users of durable equipment than intrabrand service competition with ISOs. Hence, the effect of manufacturers' practices that foreclose ISOs from service aftermarkets can be efficiency promoting rather than anticompetitive. 相似文献
594.
Truck transport of radioactive material (RAM), e.g., spent nuclear fuel (SNF), normally maximizes use of Interstate highways, which are safer and more efficient for truck transport in general. In the estimation of transportation risks, population bordering a route is a direct factor in determining consequences and an indirect factor in determining exposure times, accident probabilities and severities, and other parameters. Proposals to transport RAM may draw intense resistance from "stakeholders" based on concern for population concentrations along urban segments but the length of a route segment is also a determinative factor in estimating the transport risks. To quantify the relative importance of these two factors, a potential route for transport of SNF (strict use of Interstate highways) was selected and compared with a modified version that bypassed urban areas. The results suggest that emphasis on Interstate highways minimizes total route and urban segment risks. 相似文献
595.
Walter S. De Keseredy Shahid Alvi Martin D. Schwartz Barbara Perry 《Revue canadienne de sociologie》1999,36(4):499-516
Aucune étude nord-américaine n'a examiné de façon systé'matique l'importance des divers types degressions sexuelles, notamment le harcèlement sexuel et racial, que subissent les femmes dans les logements sociaux. Les logements sociaux et les rues des quartiers pauvres du centre-ville sont les endroits typiques où se jouent les relations de force entre les sexes et où l'influence de la drogue a exacerbé la violence exercée contre les femmes. À l'aide de données provenant du Quality of Neighbourhood Life Survey, dans lequel sont interrogés des ménages habitant dans six logements sociaux situés dans un centre urbain de Test de l'Ontario, cet article permet de combler une lacune importante dans la recherche. On y étudie les données exploratoires sur l'incidence de la violence conju-gale et de la violence extérieure ainsi que trois types de harcèlement vécus par des femmes vivant dans des logements sociaux. No North American study has systematically examined the extent of various types of woman abuse in public housing, including sexual and racial harassment. Public housing communities and inner-city ghetto streets are key arenas where gendered power relations are played out, and where the influx of drugs has exacerbated the degradation and abuse of women. Using data from the Quality of Neighbourhood Life Survey, administered to households in six public housing projects in an urban centre in Eastern Ontario, this paper helps fill a major research gap. Exploratory data on the incidence of intimate violence, stranger violence, and three types of harassment experienced by women in these dwellings are discussed. As men on the street lose their former authoritarian power in the household, they lash out against the women and children they can no longer control. Men are not accepting the new rights and roles that women are obtaining; instead, they are desperately attempting to reassert their grandfathers' lost autocratic control over their households and over public space. 相似文献
596.
Montague TH Potvin D Diliberti CE Hauck WW Parr AF Schuirmann DJ 《Pharmaceutical statistics》2012,11(1):8-13
In 2008, this group published a paper on approaches for two‐stage crossover bioequivalence (BE) studies that allowed for the reestimation of the second‐stage sample size based on the variance estimated from the first‐stage results. The sequential methods considered used an assumed GMR of 0.95 as part of the method for determining power and sample size. This note adds results for an assumed GMR = 0.90. Two of the methods recommended for GMR = 0.95 in the earlier paper have some unacceptable increases in Type I error rate when the GMR is changed to 0.90. If a sponsor wants to assume 0.90 for the GMR, Method D is recommended. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
597.
598.
Walter G. Stephan 《The Journal of social issues》2008,64(2):417-429
This article employs Allport's (1954) lens model of the causes of prejudice to analyze the articles in this issue of the Journal of Social Issues . The lens model specifies that historical, socio cultural, personality, and situational factors contribute to prejudice. The articles in this issue examine a number of variables at each of these levels of analysis, and many employ multilevel designs in which variables at more than one level are examined within the same study. Suggestions for future research on intergroup relations in Europe are offered including conducting more comparative and multilevel studies and creating comprehensive theories that integrate different levels of analysis. Some implications of the findings of these studies for intergroup relations programs are also discussed. 相似文献
599.
600.
Walter Korpi 《International Journal of Social Welfare》2010,19(Z1):S14-S24
Korpi W. Class and gender inequalities in different types of welfare states: the Social Citizenship Indicator Program (SCIP) Int J Soc Welfare 2010: ??: ??–??© 2010 The Author(s), Journal compilation © 2010 Blackwell Publishing Ltd and International Journal of Social Welfare. This article considers the role of legislated welfare state institutions as mediators of effects of political and structural forces on citizens' levels of living of relevance to inequalities in health and mortality. The focus is on institutional structures of welfare state programmes relevant to class inequality, as indicated by income inequalities, and to gender inequality, conceived of as differences in agency. I introduce the Social Citizenship Indicator Program, a database providing quantitative and qualitative information on structures of main social insurance programmes in 18 countries from 1930 to 2000, on about 300,000 data points. It is used to delineate types of distributive institutions of relevance for income inequality. Institutions relevant for gendered agency inequality affect choices by women, especially mothers, between unpaid and paid work. Driving forces behind the emergence of differences in distributive institutions are discussed, and patterns of class and gender inequalities are outlined. 相似文献