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51.
Clustered data analysis is characterized by the need to describe both systematic variation in a mean model and cluster‐dependent random variation in an association model. Marginalized multilevel models embrace the robustness and interpretations of a marginal mean model, while retaining the likelihood inference capabilities and flexible dependence structures of a conditional association model. Although there has been increasing recognition of the attractiveness of marginalized multilevel models, there has been a gap in their practical application arising from a lack of readily available estimation procedures. We extend the marginalized multilevel model to allow for nonlinear functions in both the mean and association aspects. We then formulate marginal models through conditional specifications to facilitate estimation with mixed model computational solutions already in place. We illustrate the MMM and approximate MMM approaches on a cerebrovascular deficiency crossover trial using SAS and an epidemiological study on race and visual impairment using R. Datasets, SAS and R code are included as supplemental materials. Copyright © 2013 John Wiley & Sons Ltd 相似文献
52.
We consider truthful implementation of the socially efficient allocation in an independent private‐value environment in which agents receive private information over time. We propose a suitable generalization of the pivot mechanism, based on the marginal contribution of each agent. In the dynamic pivot mechanism, the ex post incentive and ex post participation constraints are satisfied for all agents after all histories. In an environment with diverse preferences it is the unique mechanism satisfying ex post incentive, ex post participation, and efficient exit conditions. We develop the dynamic pivot mechanism in detail for a repeated auction of a single object in which each bidder learns over time her true valuation of the object. The dynamic pivot mechanism here is equivalent to a modified second price auction. 相似文献
53.
Children may be more susceptible to toxicity from some environmental chemicals than adults. This susceptibility may occur during narrow age periods (windows), which can last from days to years depending on the toxicant. Breathing rates specific to narrow age periods are useful to assess inhalation dose during suspected windows of susceptibility. Because existing breathing rates used in risk assessment are typically for broad age ranges or are based on data not representative of the population, we derived daily breathing rates for narrow age ranges of children designed to be more representative of the current U.S. children's population. These rates were derived using the metabolic conversion method of Layton (1993) and energy intake data adjusted to represent the U.S. population from a relatively recent dietary survey (CSFII 1994–1996, 1998). We calculated conversion factors more specific to children than those previously used. Both nonnormalized (L/day) and normalized (L/kg-day) breathing rates were derived and found comparable to rates derived using energy estimates that are accurate for the individuals sampled but not representative of the population. Estimates of breathing rate variability within a population can be used with stochastic techniques to characterize the range of risk in the population from inhalation exposures. For each age and age-gender group, we present the mean, standard error of the mean, percentiles (50th, 90th, and 95th), geometric mean, standard deviation, 95th percentile, and best-fit parametric models of the breathing rate distributions. The standard errors characterize uncertainty in the parameter estimate, while the percentiles describe the combined interindividual and intra-individual variability of the sampled population. These breathing rates can be used for risk assessment of subchronic and chronic inhalation exposures of narrow age groups of children. 相似文献
54.
西方经济学上的边际革命对美国现代刑法学的发展产生了重要影响.在美国刑罚理论的发展上,形成了一条区别于传统路线的边际主义路线.这条路线确立了新的刑罚目的观念——从个人角度出发的犯罪预防目的,既与报应刑观念不同,也与基于社会防卫的目的刑观念不同;它建立了微观的、定量的、动态的刑罚认识与分析模式,对传统路线下的宏观、定性的、静态的模式产生了强烈冲击.当前,边际主义路线的研究热点当属边际威慑分析. 相似文献
55.
代艳丽 《南华大学学报(社会科学版)》2008,9(5):66-68
弱势群体从法律意义上讲是指在社会转型时期,因社会制度安排等非个人因素而导致的在生存、就业或合法权益保障方面处于弱势地位,需要由国家通过法定形式予以救济的人群共同体。弱势群体“弱势”的实质是权利弱势。弱势群体权利保护的法律理念应为：公平、正义、秩序和发展权。 相似文献
56.
王力媛 《湖北民族学院学报(哲学社会科学版)》2006,24(5):36-38
民族工作必须体现时代的精神,党中央在我国社会主义建设的关键时期提出的各民族需“共同团结奋斗,共同繁荣发展”,顺应了时代的要求。少数民族的发展只有在建设中国特色社会主义的共同事业中才能逐步解决。 相似文献
57.
孙中山的社会福利思想探析 总被引：1，自引：0，他引：1
孙中山的社会福利观一方面继承了中国社会福利思想的传统,又受到资产阶级民主革命和西方福利思想的影响,形成他颇具特色的社会福利观,成为其民生主义的重要内容。孙中山关注社会弱势群体,认为为国民提供社会福利是政府的责任,倡导社会福利的制度化和法治化建设。孙中山的社会福利思想对民国的社会福利实践产生了重要影响,在中国社会思想史上占有重要的地位。 相似文献
58.
改革开放以来,在传统的计划型劳动力就业机制向新兴的市场型劳动力就业机制转变的过程中,一大批失业人员成为处手社会底层的弱势群体。正确认识这一群体的现状,并提出积极有效的解决对策,对于正确处理人民内部的利益矛盾和构建和谐社会具有一定的理论和现实意义。 相似文献
59.
刘秀光 《洛阳理工学院学报(社会科学版)》2012,(6):79-81
日益短缺的水资源面临的价格与节约的冲突,成为自然资源经济学的一个难解之题：水资源严重短缺的趋势,需要通过价格调整其分配与消费,而作为公用事业产品的生活用水,价格的长期粘性不利于水资源节约。提出这个问题,意在提示人们共同探讨破解这一难题的方法。 相似文献
60.
《Journal of Statistical Computation and Simulation》2012,82(3):419-430
A marginal–pairwise-likelihood estimation approach is examined in the mixed Rasch model with the binary response and logit link. This method belonging to the broad class of composite likelihood provides estimators with desirable asymptotic properties such as consistency and asymptotic normality. We study the performance of the proposed methodology when the random effect distribution is misspecified. A simulation study was conducted to compare this approach with the maximum marginal likelihood. The different results are also illustrated with an analysis of the real data set from a quality-of-life study. 相似文献