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Vivian?ViallonEmail author Sophie?Lambert-Lacroix H?lger?Hoefling Franck?Picard 《Statistics and Computing》2016,26(1-2):285-301
Using networks as prior knowledge to guide model selection is a way to reach structured sparsity. In particular, the fused lasso that was originally designed to penalize differences of coefficients corresponding to successive features has been generalized to handle features whose effects are structured according to a given network. As any prior information, the network provided in the penalty may contain misleading edges that connect coefficients whose difference is not zero, and the extent to which the performance of the method depend on the suitability of the graph has never been clearly assessed. In this work we investigate the theoretical and empirical properties of the adaptive generalized fused lasso in the context of generalized linear models. In the fixed \(p\) setting, we show that, asymptotically, adding misleading edges in the graph does not prevent the adaptive generalized fused lasso from enjoying asymptotic oracle properties, while forgetting suitable edges can be more problematic. These theoretical results are complemented by an extensive simulation study that assesses the robustness of the adaptive generalized fused lasso against misspecification of the network as well as its applicability when theoretical coefficients are not exactly equal. Our contribution is also to evaluate the applicability of the generalized fused lasso for the joint modeling of multiple sparse regression functions. Illustrations are provided on two real data examples. 相似文献
23.
The article discusses the nature of the tangled interaction between the ex-Soviet Central Asian republics and the outside
great powers – Russia, the United States and China. Although the so-called Great Game model is often used to explain the geopolitical
rivalry in the region, the current pattern of relations between various international actors is much more complex than a traditional
tug-of-war between the old colonial empires. While Russia's strategic role in Central Asia appears to be on the rise, the
capacity of the West to influence political developments in the region has diminished. However, the overall situation in Central
Asia remains volatile and its geopolitical landscape is far from being settled. 相似文献
24.
Upon reviewing the extant literature on determinants of unionism, it becomes clear that many areas that have had a plethora
of research attention do not converge upon singularly directional findings. This study explores a potential cause of such
an apparent anomaly: nonlinearity of data. An exploratory examination of correlation coefficients among typical union determinant
variables seems to show different patterns of relationships at different levels of union demand. Thus, a break from traditional
linear data analysis techniques is explored in the interest of explaining more variance with typical, theoretically derived
variables by using neural network analysis. Results of analyses on industry level data reveal that using neural network analysis
to model union demand explained over four times as much variance as multiple regression analysis. 相似文献
25.
This paper studies natives’ economically motivated preferences over different levels of immigration of low-income earners. Immigration affects natives through both intra- and intergenerational redistribution programmes and in the labour market. Our analysis suggests, in a welfare state that looks after the poor and the aged, economic motivation does not necessarily lead a native to have an extreme opinion on the preferable level of immigration, although it causes disagreement among natives. We find, regardless of parameter values, high-income earners prefer at least as much immigration as low-income earners who, in turn, prefer at least as much immigration as pensioners. The median voter is then likely to be a low-income native.
相似文献
Yuji TamuraEmail: Fax: +44-24-76523032 |
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本文是对清华大学教授葛兆光新著《中国思想史》第一卷的学术评论。文章认为 ,葛先生“重写”思想史的基本路子即以论带史、以今视昔、以文领义 ,而“基本路子只有一条 ,一分为三 ,乃是方便说法”。事实上 ,思想史领域本来就别有洞天 ,“葛先生自许的突破之处 ,不过是划地为牢 ,然后纵身一跃 ,作突破状而已。”文章还批评了《中国思想史》中存在的理路不清、用词不当的一些“大议论”。本文作者总结道 :如果要我用一句话来评论这本书 ,我将说 :“在这本号称‘思想史’的书里 ,我看不到历史上的思想和知识 ,我只看到现在一位中国人葛兆光的‘思想’”。 相似文献
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李文耀 《烟台大学学报(哲学社会科学版)》2000,13(1):3-7
本文探讨了科学发现过程中的非理性因素直觉、灵感,等等,它们在科学研究中往往起到十分重要的作用.文章阐述了灵感思维的突发性、非逻辑性等特点,以及机遇在加速科学发现进程中所起的作用.文章指出,研究环境尤其研究单位的学风、传统和学术水平等,对于科研的进程和成败起着极大的作用,并以诺贝尔奖得主的情况作了深入的讨论. 相似文献
29.
试论企业技术创新激励与约束机制 总被引:1,自引:0,他引:1
和云 《云南民族大学学报(哲学社会科学版)》2001,18(2):30-33
由于缺乏有效的企业技术创新的激励机制和约束机制,致使相当部分国有企业缺乏创新的热情和责任,不能成为技术创新的主体,激励机制与约束机制是企业技术创新的动力机制,只有尽快建立相对完善的激励机制和约束机制,才能保证企业技术创新活动的健康发展. 相似文献
30.
温树斌 《烟台大学学报(哲学社会科学版)》2000,13(1):22-28
国家主权与国际法的关系一直是国际法领域倍受关注的热门话题之一.为了正确辨析两者之间的关系,首先必须弄清主权的性质、主权与主权权利的不同概念及相互关系.笔者认为,主权权利区别于主权的特征在于,不仅其自身具有可分割或可让与性,而且可与主权相分离,甚至全部主权权利的不能行使也不构成对主权的否定.以此为基础,本文将主权与国际法的关系划分为两个层面,即国家主权与国际法相互依存的关系、国际法对主权权利的丰富、发展和限制的关系. 相似文献