双重价格机制下经济系统的运行研究

本文研究双重价格机制下经济系统的运行,建立了混合经济的价值理论,证明了竞争均衡的存在性,这一研究对于理解混合经济系统的运行有重要的意义。     

Optimal Nonparametric Estimation of First‐price Auctions

This paper proposes a general approach and a computationally convenient estimation procedure for the structural analysis of auction data. Considering first‐price sealed‐bid auction models within the independent private value paradigm, we show that the underlying distribution of bidders' private values is identified from observed bids and the number of actual bidders without any parametric assumptions. Using the theory of minimax, we establish the best rate of uniform convergence at which the latent density of private values can be estimated nonparametrically from available data. We then propose a two‐step kernel‐based estimator that converges at the optimal rate.     

英语移就的态度功能

本文根据实际语料对英语移就辞格中的态度功能进行了详细分析。结果发现,移就具有情感、判断和鉴赏三种态度功能;而且,移就的态度功能主要由移用语来体现。同时,由于移就是一种临时搭配,其中的移用语不仅是对移用前所修饰事物的描述,也是对现有搭配中事物的描述,所以常具有两种态度功能。此外,移就的态度功能与移就类别有密切联系,情感功能主要由“移情于物”表达,判断和鉴赏则多以“移非情于物”体现。      

A mixed-effects least square support vector regression model for three-level count data

Hierarchical study design often occurs in many areas such as epidemiology, psychology, sociology, public health, engineering, and agriculture. This imposes correlation in data structure that needs to be account for in modelling process. In this study, a three-level mixed-effects least squares support vector regression (MLS-SVR) model is proposed to extend the standard least squares support vector regression (LS-SVR) model for handling cluster correlated data. The MLS-SVR model incorporates multiple random effects which allow handling unequal number of observations for each case at non-fixed time points (a very unbalanced situation) and correlation between subjects simultaneously. The methodology consists of a regression modelling step that is performed straightforwardly by solving a linear system. The proposed model is illustrated through numerical studies on simulated data sets and a real data example on human Brucellosis frequency. The generalization performance of the proposed MLS-SVR is evaluated by comparing to ordinary LS-SVR and some other parametric models.     

Focused estimation for noisy and small data sets: a Bayesian minimum expected loss estimator approach

Central to many inferential situations is the estimation of rational functions of parameters. The mainstream in statistics and econometrics estimates these quantities based on the plug‐in approach without consideration of the main objective of the inferential situation. We propose the Bayesian Minimum Expected Loss (MELO) approach focusing explicitly on the function of interest, and calculating its frequentist variability. Asymptotic properties of the MELO estimator are similar to the plug‐in approach. Nevertheless, simulation exercises show that our proposal is better in situations characterised by small sample sizes and/or noisy data sets. In addition, we observe in the applications that our approach gives lower standard errors than frequently used alternatives when data sets are not very informative.     

Structural Relationship Analysis Among Variables of Mentoring Network Characteristics,Mentoring Functions,and the Working Attitudes of North Korean Defectors

This study was conducted with a purpose to examine the structural relationship among mentoring network characteristics, mentoring functions, and the work attitudes of North Korean defectors. One hundred twenty-one North Korean defectors participated in the study, who were involved in settlement programs in Seoul, Korea. Amos 20.0 and SPSS 21.0. were used for statistical analysis. According to the developmental network theory, mentoring network characteristics include: network range, number of networks, and network intimacy. Mentoring functions include: career function, role function, and psychosocial function. The results are as follows. Mentoring network characteristics have a positive (+) effect on mentoring functions (β?=?0.267, C.R.?=?2.329, p?<?.05) and mentoring functions have a positive (+) effect on work attitude (β?=?0.703, C.R.?=?6.748, p?<?.001). Mentoring characteristics also have an indirect effect on work attitude through mentoring functions (β?=?0.188). The results of this study implicate the need for expanding mentoring networks and developing mentoring functions for North Korean defectors in both formal and informal social network areas.     

Happiness of Hong Kong youth from 2000 to 2014: empirical evidence on the differential impact of socioeconomic conditions on youth versus other age groups

This paper aims to explain why Hong Kong youth have become unhappier than older people in recent years. We test in this connection six hypotheses, using random effects ordinal logistic regressions with a combined macro-micro dataset from official statistics and a longitudinal opinion survey project from 2000 to 2014. The results show that the decline in the happiness level in recent years is more significant for Hong Kong youth than for older people. We also find evidence of age heterogeneity in the impacts of both macroeconomic conditions and the housing price on happiness. GDP per capita has a weaker positive effect on youth’s happiness than it does on older people. The positive correlation between housing price and happiness is valid for older people only. Rapid economic growth and the rise in the price of housing have made older people happier than youth since the early 2010s.     

基于CVaR风险度量的V2G备用合约优化与协调决策

针对单一风险中性电网公司与单一风险规避电动汽车用户所组成的渠道结构,基于考虑V2G备用的备用交易及实践中普通存在的"保底收购,随行就市"合约价格机制,在CVaR风险度量准则下,构建了具有风险规避特性的电动汽车用户电量预留决策模型,先后考察并比较了分散和集成决策下电网公司与电动汽车用户的最优决策行为。研究发现：电动汽车用户的风险规避特性降低了渠道绩效水平,传统的"保底收购,随行就市"价格机制并不能很好地协调此类V2G备用渠道。在此基础上,利用"回购补贴+市场保护价+保证金"联合契约使得合作系统达到完美协调,且渠道双方的利润均得到Pareto改进。算例分析表明了上述提出模型与方法的基本特征。     

Exact distribution of a modified Behrens–Fisher statistic

The exact distribution of a modified Behrens–Fisher statistic is derived. The distribution function is mostly elementary and is simpler than the exact distribution derived by Nel et al. Its practical use (including computationalefficiency and computational convenience) is discussed.