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81.
82.
We propose a more efficient version of the slice sampler for Dirichlet process mixture models described by Walker (Commun.
Stat., Simul. Comput. 36:45–54, 2007). This new sampler allows for the fitting of infinite mixture models with a wide-range of prior specifications. To illustrate
this flexibility we consider priors defined through infinite sequences of independent positive random variables. Two applications
are considered: density estimation using mixture models and hazard function estimation. In each case we show how the slice
efficient sampler can be applied to make inference in the models. In the mixture case, two submodels are studied in detail.
The first one assumes that the positive random variables are Gamma distributed and the second assumes that they are inverse-Gaussian
distributed. Both priors have two hyperparameters and we consider their effect on the prior distribution of the number of
occupied clusters in a sample. Extensive computational comparisons with alternative “conditional” simulation techniques for
mixture models using the standard Dirichlet process prior and our new priors are made. The properties of the new priors are
illustrated on a density estimation problem. 相似文献
83.
The current growth of the service sector in global economies is unparalleled in human history—by scale and speed of labor migration. Even large manufacturing firms are seeing dramatic shifts in percent revenue derived from services. The need for service innovations to fuel further economic growth and to raise the quality and productivity levels of services has never been greater. Services are moving to center stage in the global arena, especially knowledge‐intensive business services aimed at business performance transformation. One challenge to systematic service innovation is the interdisciplinary nature of service, integrating technology, business, social, and client (demand) innovations. This paper describes the emergence of service science, a new interdisciplinary area of study that aims to address the challenge of becoming more systematic about innovating in service. 相似文献
84.
Jim Clemmer 《经理人》2009,(11):70-71
你为何如此忙碌?是忙那些能让你、团队和组织奔向愿景的重要事务吗?还是仅仅为忙碌而忙碌?在《要事第一》中,斯蒂芬·柯维、罗杰·梅里尔和丽贝卡·梅里尔写道:“人们期望我们忙碌,超负荷工作。在当今社会,‘忙’已逐渐成为身份的象征一如果忙,我们就是重要人物;如果不忙——我们简直羞于承认……通过忙碌,我们会得到安全感。忙,是种流行病,也让人上瘾。忙,更为我们没时间处理要事找了个好借口。” 相似文献
85.
The post-war generation of baby boomers has witnessed major transformations in family life as well as being at the vanguard of them. A study undertaken in Paris and London in 2006 among 90 individuals born between 1945 and 1954 reveals, however, strong relationships with ageing parents and adult children. Family groups based on local or dispersed entourages, with regular contact and the exchange of support, are clearly identified. Other configurations include families where affective ties persist but contact between the baby boomers and their entourage is less frequent. Few baby boomers have replaced family members with friends or remain socially isolated. These results show that the rise of individualism associated with the baby boomers has not weakened inter-generational ties, although tensions exist between the demands of family solidarity and individual projects. 相似文献
86.
Brianne H. Kothari Paul Sorenson Lew Bank Jim Snyder 《Journal of Family Social Work》2013,16(4):324-343
Interpersonal relationships within and outside the family have been a central part of alcohol and substance use research. Many studies have focused on the role of parents and peers; fewer studies have focused on siblings. This article examines siblings’ roles in alcohol, tobacco, and other drug (ATOD) use patterns and trajectories in the context of familial and nonfamilial factors across time. First, intraclass correlations were used to examine the degree to which older siblings’ ATOD use was associated with younger siblings’ ATOD use. Second, hierarchical regression analyses were conducted to examine the degree to which individual, parent, sibling, and peer factors over time were associated with adolescents’ and young adults’ ATOD use. It should be noted that developmentally proximal predictors were utilized in these models and within-family replication was also examined. Results demonstrate strong associations between older and younger siblings’ ATOD use. Moreover, the developmentally proximal sibling variables were predictive of younger sibling ATOD use in the context of other variables across all substances. Study findings are discussed in terms of identifying promising and potentially malleable points of intervention for future investigators. 相似文献
87.
We present an analysis and discussion of the tanda, a multiperson pooled credit and savings scheme (a rotating credit association or RCA), as described by two informants from Mexican immigrant communities in California. In the tanda, participants contribute regularly to a common fund which is distributed to participants on a rotating basis. We analyze the tanda at multiple levels (as a mathematical, cultural, and distributed practice) and identify points of intersection and conflict. Contrary to many formal or school-based conceptions of mathematics, mathematical work in the context of the tanda is in service of, and intimately tied up with, cultural goals and values. Likewise, cultural means and mathematics are employed to personal ends. We argue that the tanda should be of enduring interest, particularly among educators interested in bringing more authentic, culturally-relevant mathematics into classroom settings, because it so clearly illustrates how mathematical and cultural processes can interact in the context of personal goals, and provides a potentially valuable template for engaging, consequential, and successful mathematics. 相似文献
88.
The paper reports secondary analysis of data from the 2010 British Gambling Prevalence Survey, a household survey of a representative sample of the population aged 16 years and over (N = 7756). Responses to questions about frequency of gambling and average monthly spend on each of 15 forms of gambling, and responses to two different problem gambling screens (DSM-IV and PGSI), were used to derive estimates, for each form of gambling separately, of the percentage of (1) all days play (two estimates), and (2) all spend (four estimates), attributable to problem gamblers. Although these estimates must be treated as approximations only, they demonstrate that problem gamblers make a far greater contribution to total gambling attendances and losses than problem gambling prevalence figures would suggest. There are certain forms of British gambling to which problem gamblers may be contributing as much as 20–30% of all days play and spend, and moderate risk gamblers a possible further 10–20%. 相似文献
89.
ResumenEl presente estudio supone una aplicación tentativa de la técnica del autoinforme a la codificación y decodificación de las manifestaciones corporales y expresivas asociadas al comportamiento emocional. El interés en el uso de dicha técnica radica, no tanto en la posibilidad de determinar los cambios reales asociados a la emoción, como de conocer el modo en que los sujetos recuerdan y categorizan su experiencia emocional. 相似文献
90.
Many prior efforts have examined the personal characteristics of workers or the structural features of an organization that impact job satisfaction. By contrast, we examine organizational culture in the context of "high-performance work systems." We analyze the organizational culture of the United States Postal System, as it is presented in key organizational documents and perceived by workers. It is argued that a viable theory of job satisfaction in the modern workplace must treat worker perceptions, which spring from an organizational culture that is both prescribed and lived. 相似文献