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761.
G. Casella K. L. Mengersen C. P. Robert D. M. Titterington 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2002,64(4):777-790
Summary. We consider the construction of perfect samplers for posterior distributions associated with mixtures of exponential families and conjugate priors, starting with a perfect slice sampler in the spirit of Mira and co-workers. The methods rely on a marginalization akin to Rao–Blackwellization and illustrate the duality principle of Diebolt and Robert. A first approximation embeds the finite support distribution on the latent variables within a continuous support distribution that is easier to simulate by slice sampling, but we later demonstrate that the approximation can be very poor. We conclude by showing that an alternative perfect sampler based on a single backward chain can be constructed. This alternative can handle much larger sample sizes than the slice sampler first proposed. 相似文献
762.
郭建英 《北京林业大学学报(社会科学版)》2003,2(4):61-63
自 1996年来 ,为了刺激消费 ,扩大内需 ,促进经济的复苏与繁荣 ,中国人民银行连续八次降低金融机构人民币存贷款利率 ,但我国储蓄依然居高不下 ,降息的政策效果并不明显。该文认为 ,全球经济萧条是外因 ,而经济主体 ,如居民、企业、银行、政府的行为才是导致降息低效的根本原因 ,因此 ,解决这一现实问题需要全社会共同努力 ,将降息与其它政策配套使用才能行之有效。 相似文献
763.
一、导言(一)改变中的世界经济数千年前,古代中国在比较厚实的基础之上,就已发展出灿烂的文化,而这先进的文化与经济也通过“丝绸之路”向西方传播。 相似文献
764.
Elizabeth Monk-Turner Peter Ciba Matthew Cunningham P. Gregory McIntire Mark Pollard Rebecca Turner 《Analyses of Social Issues and Public Policy》2004,4(1):1-11
In a content analysis of movie violence, we randomly selected twelve top-grossing American war films from four decades (1970 to 2002). We coded for implements of violence, length of violence, gore, and violence directed at noncombatants. We hypothesized that recently released war movies would be more violent than those released earlier. We found that films released since 1990 did contain more violence compared to others. Further, the intensity of gore increased in recently released movies. 相似文献
765.
多媒体辅助手段的运用能够大大提高课堂教学效果。该文基于对北京林业大学多媒体利用情况的调查,探讨了目前该校利用多媒体辅助手段进行英语教学存在的问题和解决方案,并论证了多媒体辅助教学在实践中的价值和意义。 相似文献
766.
创新型人才的培养与图书馆教育功能的发挥 总被引:3,自引:0,他引:3
高秀兰 《北京林业大学学报(社会科学版)》2004,(Z1)
创新型人才是具有高尚思想品德、丰富文化知识、合理知识结构、创新思维和创新能力的高素质人才。图书馆在创新型人才的培养中发挥着重要的作用 :①延伸课堂教学 ,完善创新型人才的知识结构 ;②对创新型人才实施全面的素质教育 ;③培养创新型人才的信息意识 (情报意识 )和信息能力 ;④图书馆的人文环境有利于创新型人才创新品质的培养。因此 ,图书馆应进一步加强现代化建设 ,强化其教育功能 ,以便为创新型人才的培养做出更大的贡献 相似文献
767.
The relative earnings growth for immigrants in Norway is computed. Unlike Hayfron (1998, this journal) we define immigrants
by country of origin rather than citizenship and perform separate studies of immigrants from inside and outside the OECD region.
Replicating Hayfron op.cit. we find that the earnings assimilation is considerably weaker. Further, we find that the earnings
of OECD immigrants are comparable to those of natives, while Non-OECD immigrants earn considerably less than natives at the
time of entry, but that their relative earnings improve gradually over time. Earnings of different immigrant cohorts converged
from 1980 to 1990, indicating a non-linear rate of assimilation.
Received: 7 April 2000/Accepted: 4 January 2001 相似文献
768.
769.
We measure the extent to which curbside access affects quantity recycled. We use novel data to distinguish between new recycling and material diverted from other recycling modes. We find that the marginal impact of expanding curbside programs on total recycled quantities is small, in part because curbside programs significantly cannibalize returns from drop-off recycling centers. Failure to account for cannibalization from other modes may substantially overestimate the benefits of curbside programs. We conclude with simple cost-effectiveness comparisons. Results suggest that incremental expansion of curbside access may not be cost-effective. ( JEL Q53, Q58, H72) 相似文献
770.
Coley RL Lohman BJ Votruba-Drzal E Pittman LD Chase-Lansdale PL 《Children and youth services review》2007,29(6):721-741
Numerous studies have assessed families' employment and financial stability following welfare reform. Yet little research has addressed whether welfare and work transitions are linked with other changes in family functioning. Using a representative sample of approximately 2,000 low-income urban families from the Three-City Study, analyses assessed whether mothers' welfare and employment experiences over a two-year period following welfare reform were related to changes in family well-being. Lagged regression models controlling for family characteristics and earlier levels of functioning found that moving into employment and stable employment (of 30 hours or more per week) were linked to substantial increases in income and improvements in mothers' psychological well-being. Movements into employment also were associated with declines in financial strain and food insecurity. Sustained or initiated welfare receipt was related to relative declines in income, physical health, and psychological well-being, but also to improved access to medical care. In contrast, mothers' welfare and work experiences showed very limited relations to changes in the quality of parenting or of children's home environments. These patterns were similar for families with young children and those with adolescent children. Results suggest that parenting behaviors are more resistant to change than are maternal emotional and economic functioning. 相似文献