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61.
In this paper, semiparametric methods are applied to estimate multivariate volatility functions, using a residual approach as in [J. Fan and Q. Yao, Efficient estimation of conditional variance functions in stochastic regression, Biometrika 85 (1998), pp. 645–660; F.A. Ziegelmann, Nonparametric estimation of volatility functions: The local exponential estimator, Econometric Theory 18 (2002), pp. 985–991; F.A. Ziegelmann, A local linear least-absolute-deviations estimator of volatility, Comm. Statist. Simulation Comput. 37 (2008), pp. 1543–1564], among others. Our main goal here is two-fold: (1) describe and implement a number of semiparametric models, such as additive, single-index and (adaptive) functional-coefficient, in volatility estimation, all motivated as alternatives to deal with the curse of dimensionality present in fully nonparametric models; and (2) propose the use of a variation of the traditional cross-validation method to deal with model choice in the class of adaptive functional-coefficient models, choosing simultaneously the bandwidth, the number of covariates in the model and also the single-index smoothing variable. The modified cross-validation algorithm is able to tackle the computational burden caused by the model complexity, providing an important tool in semiparametric volatility estimation. We briefly discuss model identifiability when estimating volatility as well as nonnegativity of the resulting estimators. Furthermore, Monte Carlo simulations for several underlying generating models are implemented and applications to real data are provided.  相似文献   
62.
Neighbourhood planning (NP) as enabled by the 2011 Localism Act in England has precipitated a considerable literature discussing its potential, limitations and likely shortcomings referenced against government rhetoric and the reporting of initial experiences of the process. This paper provides an overview of the current literature on neighbourhood planning and sets out how it has been received and practised across England drawing on empirical evidence. The extent of take-up and the experience of those involved in the first five years of neighbourhood planning is used to consider how community-led planning may be designed and used following operational principles of inclusivity, capacity-building and adding value.  相似文献   
63.
"资源稀释模型"认为,在家庭经济资源一定的情况下,家庭里的孩子数量越多,每个孩子分到的经济资源就会相应减少;而且家庭的经济资源对孩子是否有机会接受高等教育的影响非常重要。笔者从"资源稀释模型(Resource Dilution Model)"这一视角来分析和探讨,上世纪末我国"高等教育规模扩张"政策何以得以顺利实施。  相似文献   
64.
This paper explores one aspect of unresolved trauma, namely dissociation. Its relevance to child protection is discussed with reference to two aspects: emotional neglect and choice of partner. There is an exploration of the implications for both assessment and treatment. The central place of shame in relation to dissociation is also explored. It is argued that dissociation is an important concept in child protection assessments and that social work assessments should be alert to this.  相似文献   
65.
对于中国这个人口大国,人口承载力是一个值得研究和关注的课题,西北五省在人们的印象中是地广人稀,学界对该地区的人口承载力的研究大都从自然资源的角度探讨,然而本文不考虑自然因素的作用,认为一个区域资源的稀缺可以通过经济技术解决,只是成本高低的问题,因此仅从经济人口承载力的角度分析,利用P-E-R模型分析西北五省人口承载力,并利用ARIMA模型对2012-2015年该地区人口承载力进行预测,并得出相关结论.  相似文献   
66.
“干部积极干,农户站边看”的贫困群体脱贫逆化现象影响着农村社会的健康发展和脱贫攻坚工作的高效开展。通过田野调查发现,贫困农户脱贫主体性不足的发生逻辑首先在于小农理性下受利益驱使的农户形成争当贫困户的“自愿型贫困”,造成贫困农户“不愿”脱贫;其次,贫困农户在贫困识别、资源匹配和脱贫行动选择方面因决策受限形成“边缘化治贫”,造成农户的“不能”脱贫;最后,贫困农户受贫困文化影响导致“精神贫困”,造成贫困农户的“内卷化脱贫”。因此,需要从增加贫困农户脱贫意愿和强化贫困农户内生脱贫能力两个维度来构建贫困农户的有效脱贫主体性。  相似文献   
67.
Unexamined and unjustified assumptions are the Achilles’ heel of development programs. In this paper, we describe an evaluation capacity building (ECB) approach designed to help community development practitioners work more effectively with assumptions through the intentional infusion of evaluative thinking (ET) into the program planning, monitoring, and evaluation process. We focus specifically on one component of our ET promotion approach involving the creation and analysis of theory of change (ToC) models. We describe our recent efforts to pilot this ET ECB approach with Catholic Relief Services (CRS) in Ethiopia and Zambia. The use of ToC models, plus the addition of ET, is a way to encourage individual and organizational learning and adaptive management that supports more reflective and responsive programming.  相似文献   
68.
自20世纪70年代吉伯德-萨特思韦特防策略不可能性定理确立后,引起了数学、经济学、计算机科学和哲学等诸多领域中学者的广泛关注。然而,在国内外文献中,对吉伯德-萨特思韦特防策略不可能性定理的逻辑研究还比较少。基于此,借助公理化的方法探讨吉伯德-萨特思韦特防策略不可能性定理,并形式化地给出定理的内容和证明,力图把精细的逻辑推理应用于复杂的过程分析中,使防策略投票这一过程形式化、清晰化,以期能指导人们进行合理、有效的决策活动。  相似文献   
69.
我国宪法赋予了公民用自己的民族语言文字参加诉讼的权利,目的在于实现民族平等、促进民族团结、禁止民族分裂、保护中华民族语言文化的多样性,进而提高我国的文化软实力。通过调查民族语言文字诉讼司法实务,发现当前存在着少数民族语言文字诉讼程序混乱、不符合诉讼原理等问题,不利于民族语言文字诉讼权利的实现。究其原因,在于该诉讼制度缺乏程序保障。为了确保民族语言文字诉讼权利的有效实现,应设立“民汉双语诉讼规则”,以为司法机关提供统一的操作规范。民汉双语诉讼规则应该明确民汉双语诉讼的概念、类型以及民族语言文字诉讼权利的内容,并且根据不同诉讼类型有针对性地设置审判语言与诉讼语言的适用规则。  相似文献   
70.
We present the Interview for Decisional Abilities (IDA), a semi-structured tool for use by adult protective services (APS) workers as part of their comprehensive assessments of clients. The IDA was created in response to a Federal mandate to standardize the procedures and competencies of APS agencies with a view to improving client assessments and facilitating cross-jurisdictional research on adult mistreatment. The proximal aim of the IDA is to guide workers in gathering information on the ability of suspected victims of adult mistreatment to make decisions about the risks they face.  相似文献   
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