The non parametric regression estimate with dependent measurement errors

ABSTRACT

Non parametric regression estimation with measurement errors data has received great attention, and deconvolution local polynomial estimators can be used to deal with the problem that the errors are independent of other variables in the literature. In this article, the copula method is applied to tackle the case that the errors may depend on covariates, and the asymptotic properties of the resulting estimators are derived. Two simulations are conducted to illustrate the performance of the proposed estimators.     

A variance shift model for detection of outliers in the linear mixed measurement error models

ABSTRACT

In this paper, we extend a variance shift model, previously considered in the linear mixed models, to the linear mixed measurement error models using the corrected likelihood of Nakamura (1990 Nakamura, T. (1990). Corrected score function for errors in variables models: methodology and application to generalized linear models. Biometrika 77:127–137.[Crossref], [Web of Science ®] , [Google Scholar]). This model assumes that a single outlier arises from an observation with inflated variance. We derive the score test and the analogue of the likelihood ratio test, to assess whether the ith observation has inflated variance. A parametric bootstrap procedure is implemented to obtain empirical distributions of the test statistics. Finally, results of a simulation study and an example of real data are presented to illustrate the performance of proposed tests.     

The Implications of Using Messy Data to Estimate Production-Frontier-Based Technical Efficiency Measures

An empirical study of efficiency at the plant level, requiring production and financial data, was done using frontier function specifications. It is not evident from the implementation of the production-frontier models that different methodologies will consistently flag the same observations as being efficient or inefficient. As a result, outlier diagnostics for individual observations and for subsets of observations are used to achieve a relative index of influentiality within the spectrum of efficiency. These outlier diagnostic tests consistently flag the same subset of efficient and inefficient observations as the frontier models and additionally clarify ranking discrepancies among the frontier model specifications.     

On the Choice of Functional Forms: Summary of a Monte Carlo Experiment

The use of flexible functional forms is a standard practice in applied econometrics. Many flexible forms have been proposed. In this study, we investigate the behavior of three of them—the translog, the symmetric McFadden, and the symmetric generalized Barnett. Based on Monte Carlo experiments, we assess the ability of these forms to test theoretical properties and to measure technological characteristics.     

环境规制、R&D资本存量与绿色技术创新

科技创新是一个国家经济发展的内生动力。技术创新能力的提升需要持续的R&D投入,而R&D资本存量正是衡量持续研发投入水平的最佳指标。本文基于BEA原理,合理测算出中国大陆30个省区市（西藏除外）的R&D资本存量,并采用省际面板数据,构建空间计量模型,探讨环境规制下R&D资本存量对绿色技术创新的影响机制。研究表明：环境规制与R&D资本存量对绿色技术创新均具有促进作用,但一定强度的环境规制会挤占R&D投入资源,与R&D资本存量的累积发生“负挤出效应”,进而影响绿色技术创新;同时,R&D资本存量、环境规制对中国东部、中部与西部地区的绿色技术创新的影响呈现显著的区域异质性。因此,本文提出了制定差异化的R&D投资和环境规制策略。     

微观与宏观交易费用测量的进展及其关系研究

交易费用测量包括微观和宏观两个层次,微观层次又分为市场型、管理型和政治型交易费用测量。宏观层次即是对一国(或地区)总量交易费用的测量。在总量交易费用测量上,沃利斯和诺思1986年提出的交易行业测量法具有一定的开创性。依据该方法测量总量交易费用会发现,经济越发达,总量交易费用占GNP的比重越大,而每笔交易的交易费用越低。反之则反是。这就提出一个问题,即:总量交易费用和每笔交易的交易费用是否就是这种反比关系?要搞清这二者的关系,关键是必须将理论上的和测量到的总量交易费用两个概念区分开。事实上,理论上的总量交易费用和每笔交易的交易费用并非反比关系。     

基于碳排放视角的区域效率及其影响因素分析——低碳城市的一个测度

低碳城市建设是当前中国城市发展的重要课题,而城市低碳经济发展水平的测度则是其中的一个重要环节。本文基于碳排放视角,选择代表性国家(地区)和城市样本进行比较研究,将碳排放数量这一非期望产出变量作为投入进行处理,在科学设计DEA计量模型基础上,通过对区域整体效率及其影响因素进行实证分析,实现对低碳城市建设水平的测度,并据此进行结论分析,研究提出若干启示性建议。     

后金融危机时代公允价值计量在我国的应用

在后金融危机时代,公允价值的计量问题给我们留下了广泛的思考空间。从金融危机中各方对公允价值的争议出发,通过对公允价值的背景、定义、计量方法的回顾及其优劣势的分析,在肯定公允价值计量的基础上,提出了相应的改进意见。     

Dimensions of Identity Development Scale: Confirmatory factor analysis,gender invariance,and external validity of the Persian version

The present study was conducted to examine the psychometric properties and gender invariance of the Iranian version of the Dimensions of Identity Development Scale (DIDS). A total of 1453 adolescents (50.8% female; 14–18 years old, mean = 15.48) participated in a cross-sectional study and completed the DIDS and the Youth Self-Report of behavior problems. The Confirmatory Factor Analysis supported the six-factor model of the DIDS, echoing past studies showing the original 5th factor (Exploration in Depth) being divided into Exploration in Depth and Reconsidering the Commitment. The invariance testing showed comparable measurement properties of the DIDS across males and females (strict measurement invariance). Further, behavior problems were associated positively with Ruminative Exploration and negatively with Commitment Making, Identification with Commitments, Exploration in Depth, and Reconsideration of Commitments, whereas the opposite was true for academic performance. A six-factor DIDS was shown to be a valid and reliable measure for the assessment of identity development dimensions among Iranian adolescents. Future studies in the Iranian context evaluating the identity clusters derived from identity dimensions and their gender differences are warranted.     

高校教学秘书参与教学管理的角色研究综述——基于CNKI的计量统计分析

教学秘书是高校教学管理的基层参与者,在深化教学改革的进程中,教学秘书角色愈显重要。以计量学方法分析CNKI近十五年来教学秘书相关研究文献,了解到教学秘书参与教学管理的角色研究热度不高且近年呈逐年下降趋势;研究文献分布广泛但不均匀,集中于少数期刊,而且质量不佳;研究作者中存在高产群体,但核心群体还未形成;研究主题内容丰富,以教学管理为核心,探讨了教学秘书的角色作用、工作职责、素质能力要求,以及教学秘书队伍中存在的问题与如何加强队伍建设等方面,但研究深度不够。证明了教学秘书群体在教学管理工作中不可或缺却又不受重视的角色困境。