谈建设工程造价的全过程控制

建设项目工程造价管理的基本内容就是合理确定和有效地控制工程造价．本文对如何做到“事前把关、过程与动态管理为特征”的全过程控制进行了论述．     

Affine LIBOR models driven by real-valued affine processes

The class of affine LIBOR models is appealing since it satisfies three central requirements of interest rate modeling. It is arbitrage-free, interest rates are nonnegative, and caplet and swaption prices can be calculated analytically. In order to guarantee nonnegative interest rates affine LIBOR models are driven by nonnegative affine processes, a restriction that makes it hard to produce volatility smiles. We modify the affine LIBOR models in such a way that real-valued affine processes can be used without destroying the nonnegativity of interest rates. Numerical examples show that in this class of models, pronounced volatility smiles are possible.     

日本电信价格规制评析

日本政府在电信民营化和电信规制改革的推进过程中,充分吸收了欧美等国电信价格规制经验。经过多次法律调整和制度完善,逐渐形成了现行的以基础电信服务、指定电信服务和特定电信服务等公共电信服务为规制对象的价格规制体系。在实行价格上限规制的基础上,日本电信市场逐渐形成了全方位竞争的市场格局。     

土地价格与农村土地流转的有效运作

阐述了研究土地价格的意义、制定土地价格的依据、我国农村土地的流转及其价格的计算方法。     

A varying coefficient approach to estimating hedonic housing price functions and their quantiles

The varying coefficient (VC) model introduced by Hastie and Tibshirani [26 T. Hastie and R. Tibshirani, Varying-coefficient models, J. R. Statist. Soc. (Ser. B) 55 (1993), pp. 757–796.[Web of Science ®] , [Google Scholar]] is arguably one of the most remarkable recent developments in nonparametric regression theory. The VC model is an extension of the ordinary regression model where the coefficients are allowed to vary as smooth functions of an effect modifier possibly different from the regressors. The VC model reduces the modelling bias with its unique structure while also avoiding the ‘curse of dimensionality’ problem. While the VC model has been applied widely in a variety of disciplines, its application in economics has been minimal. The central goal of this paper is to apply VC modelling to the estimation of a hedonic house price function using data from Hong Kong, one of the world's most buoyant real estate markets. We demonstrate the advantages of the VC approach over traditional parametric and semi-parametric regressions in the face of a large number of regressors. We further combine VC modelling with quantile regression to examine the heterogeneity of the marginal effects of attributes across the distribution of housing prices.     

Combined asymmetric spatial weights matrix with application to housing prices

In this study, a combined asymmetric spatial weights matrix is proposed for capturing the unequal spatial dependence of housing prices, where the advantage of this matrix was demonstrated by a non-nested hypothesis test. To explore the heterogeneous spatial impacts of urban essential characteristics on housing prices over the eastern, central, and western regions of China, after the Lagrange multiplier and likelihood ratio tests, the spatial Durbin model using the proposed weights matrix was applied to each region. The estimation results showed that the direct impacts of college and new employment were significantly negative in the eastern region, but not significant in the central and western regions. By contrast, the direct impacts of hospitals and scenic spots were significantly positive in eastern China, but not significant in central and western China. In addition, the indirect impacts of the four variables were not significant in the three regions. These results suggest that in eastern China, the government may increase the requirements for using medical resources and close tourist attractions in a single city to cool down the skyrocketing housing prices in this area.     

Objective Tests versus Subjective tests

objective test has only one correct answer, while subjective test has a range of possible answers. Because of this feature, reliability will not be difficult to achieve in the marking of the objective item, while the marking of the subjective items is reliable. On the whole, a good test must contain both subjective and objective test items.     

等价交换中的不平等问题研究

劳动生产率差异、供求非均衡、垄断、非对称信息和非市场定价等条件下的商品交换都会产生不平等问题,但这类不平等问题都源于不等价交换。实际上,商品的等价交换仍然会产生不平等问题,其直接原因在于生产价格的形成,而生产价格的形成是隶属于不同所有者或利益主体的资本追逐利润的结果。生产价格形成后,价值(剩余价值)在不同产业或地区之间发生了转移,劳动投入和所得不再完全一致。不过,这种不一致在一国范围内和世界市场上具有本质的区别。     

自然资源经济学的难解之题——水资源价格与节约的冲突

日益短缺的水资源面临的价格与节约的冲突,成为自然资源经济学的一个难解之题：水资源严重短缺的趋势,需要通过价格调整其分配与消费,而作为公用事业产品的生活用水,价格的长期粘性不利于水资源节约。提出这个问题,意在提示人们共同探讨破解这一难题的方法。     

Nonparametric beta kernel estimator for long and short memory time series

In this article we introduce a nonparametric estimator of the spectral density by smoothing the periodogram using beta kernel density. The estimator is proved to be bounded for short memory data and diverges at the origin for long memory data. The convergence in probability of the relative error and Monte Carlo simulations show that the proposed estimator automatically adapts to the long- and the short-range dependency of the process. A cross-validation procedure is studied in order to select the nuisance parameter of the estimator. Illustrations on historical as well as most recent returns and absolute returns of the S&P500 index show the performance of the beta kernel estimator. The Canadian Journal of Statistics 48: 582–595; 2020 © 2020 Statistical Society of Canada