On f-tests and linear hypothesis in a general linear model

A simple method of setting linear hypotheses testable by F-tests in a general linear model when the covariance matrix has a general form and is completely unknown, is provided. With some additional conditions imposed on the covariance matrix, there exist the UMP invariant tests of certain linear hypotheses. We derive them to compare the powers with those of F-tests obtained under no restrictions on the covariance matrix. The results are illustrated in a multiple regression model with some examples.     

Some Observations,a Suggestion,and Some Comments on the Conway-Roberts Article

This article provides new tools for the evaluation of dynamic stochastic general equilibrium (DSGE) models and applies them to a large-scale new Keynesian model. We approximate the DSGE model by a vector autoregression, and then systematically relax the implied cross-equation restrictions and document how the model fit changes. We also compare the DSGE model's impulse responses to structural shocks with those obtained after relaxing its restrictions. We find that the degree of misspecification in this large-scale DSGE model is no longer so large as to prevent its use in day-to-day policy analysis, yet is not small enough to be ignored.     

Seasonal Time Series and Transfer Function Modeling

A simple modification is suggested for the construction of transfer function models relating an output variable Y_t to an input variable X_t when the model for X_t contains operators that cancel out. In addition, the evaluation of transfer function models is discussed by comparing the forecasts with the actual observations.     

Out-of-Sample Forecast Tests Robust to the Choice of Window Size

This article proposes new methodologies for evaluating economic models’ out-of-sample forecasting performance that are robust to the choice of the estimation window size. The methodologies involve evaluating the predictive ability of forecasting models over a wide range of window sizes. The study shows that the tests proposed in the literature may lack the power to detect predictive ability and might be subject to data snooping across different window sizes if used repeatedly. An empirical application shows the usefulness of the methodologies for evaluating exchange rate models’ forecasting ability.     

Estimation of firm-specific technological bias,technical change and total factor productivity growth: a dual approach

This paper deals with modeling firm-specific technical change (TC), and technological biases (inputs and scale) in estimating total factor productivity (TFP) growth. Several dual parametric econometric models are used for this purpose. We examine robustness of TFP growth and TC among competing models. These models include the traditional time trend (TT) model and the general index (GI) model. The TT and the GI models are generalized to accommodate firm-specific TC and technological bias (in inputs and output). Both nested and non-nested tests are used to select the appropriate models. Firm-level panel data from the Japanese chemical industry during 1968- 1987 is used as an application.     

高等农业职业教育《淡水养殖水化学》开展研究性学习的探索

国际 2 1世纪教育委员会的报告《教育———财富蕴藏其中》中提出面对未来社会的发展的 4种基本要求———学会认知、学会做事、学会共处、学会生存。这说明 ,在现代教育中 ,必须以学生发展为中心 ,开展研究性学习。我国实施的研究性学习就是改变我国传统的以教师为中心的教学模式 ,突出学生在学习中的主导地位。从贯彻素质教育的宗旨出发 ,在学科教学中渗透研究性学习 ,是培养学生综合能力的一种尝试和实践。     

可持续发展动态评价研究——以湖北省为例

在阐明可持续发展基本理论的基础上，根据省情，从经济、社会、资源、环境四方面构建湖北省可持续发展指标体系，针对小样本数据特点，运用灰色关联分析法、偏最小二乘回归对其可持续发展状况进行动态评价。     

基于工具-目标法的经济政策效应评价研究

经济政策评价不仅指政策决策评价，还应包括对政策执行效果进行评价，即效应评价。但目前在计量经济学的研究中，包括已出版的各类教科书中也都只给出了如何进行决策评价的方法，而没有对效应评价方法进行研究。这显然是欠缺的。采用经济计量分析法对经济决策评价，常用的方法有三种：工具-目标法（TOM）、最优控制法、政策模拟法。其中工具-目标法是最早用来进行政策决策评价的计量方法，它是由首届诺贝尔经济学奖得主之一丁伯根提出的。     

寿险公司偿付能力的综合评价

偿付能力是衡量一个公司经济能力的综合指标，而偿付能力监管是保险监管的首要目标，也是保险公司风险管理的主要内容。依据中国保监会对寿险公司偿付能力监管的要求，选取了九个财务指标，运用主成分分析法对18家活跃在中国保险市场的寿险公司的偿付能力进行了综合评价，提出应当拓宽保险资金运用渠道，优化管理结构，引进优秀人才，改进偿付能力评估办法，从而有效地提高中国寿险公司偿付能力。     

中国宏观经济预警体系的评价与修正

摘　　要:中国宏观经济预警体系建立于20世纪90年代初,十多年来为国家宏观调控提供了可靠的信息,成为宏观调控的主要依据之一。然而,进入本世纪以来,中国经济的运行格局发生了重大变化,导致预警体系的敏感度和预测精度出现了偏差,已经到了需要修正的时候。本文在对中国宏观预警体系分析与评价的基础上,对体系的结构与指标提出了修正的思路与方案。