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1.
The parameter estimates based on an econometric equation are biased and can also be inconsistent when relevant regressors are omitted from the equation or when included regressors are measured with error. This problem gets complicated when the `true' functional form of the equation is unknown. Here, we demonstrate how auxiliary variables, called concomitants, can be used to remove omitted-variable and measurement-error biases from the coefficients of an equation with the unknown `true' functional form. The method is specifically designed for panel data. Numerical algorithms for enacting this procedure are presented and an illustration is given using a practical example of forecasting small-area employment from nonlinear autoregressive models.  相似文献
2.
大额支付系统流动性风险度量分析   总被引:1,自引:1,他引:0       下载免费PDF全文
支付系统是一个国家最重要的金融基础设施之一,大额实时支付系统作为支付系统的重要组成部分,比其他结算手段更快速、更准确、更安全,是目前国内最快捷的结算手段之一.因此,提高大额支付系统流动性,降低系统流动性风险,显得日益重要.通过建模,量化了流动性需求指标和结算延迟指标,并利用面板数据建立随机效应模型来度量大额支付系统潜在流动性风险发生的概率.  相似文献
3.
Empirical studies of variations in debt ratios across firms have analyzed important determinants of capital structure using statistical models. Researchers, however, rarely employ nonlinear models to examine the determinants and make little effort to identify a superior prediction model among competing ones. This paper reviews the time-series cross-sectional (TSCS) regression and the predictive abilities of neural network (NN) utilizing panel data concerning debt ratio of high-tech industries in Taiwan. We built models with these two methods using the same set of measurements as determinants of debt ratio and compared the forecasting performance of five models, namely, three TSCS regression models and two NN models. Models built with neural network obtained the lowest mean square error and mean absolute error. These results reveal that the relationships between debt ratio and determinants are nonlinear and that NNs are more competent in modeling and forecasting the test panel data. We conclude that NN models can be used to solve panel data analysis and forecasting problems.  相似文献
4.
利用FPDP总线和高速DAC芯片设计一个高速高精度DAC模块,可用于实时产生SAR及其他脉冲雷达信号。为了达到DAC的设计精度,在设计中特别注意了电源、时钟等重要信号的处理。系统设计时利用FPDP总线数据传送到DAC转换模块,解决了数据传输率的问题。FPGA完成FPDP总线接口、DAC控制和数据格式转换等功能,简化了系统设计。  相似文献
5.
随着仿真培训系统得到广泛应用,早期采用指针式仿真仪表的仿真仪表盘已经不能适应新的需要。该文提出了一种基于采用液晶显示单元、通过RS-485接口传输数据的新型仿真仪表盘的构造方法,介绍了系统的设计目标和总体结构。仿真仪表采用了单片机系统,给出了原理图,讨论了相关软件。教师指令台工作在Windows 2000系统下,讨论了软件编制的关键技术。在本系统中通讯软件是系统的关键,给出了数据传输过程中的数据帧结构。最后介绍了与本系统有关的其它技术。  相似文献
6.

Background

The purpose of the study was to probe into the changes in life expectancy associated with schooling years found by the Organization for Economic Co-operation and Development (OECD).

Methods

The study was based on the OECD database from the period 2000 to 2006. The data of thirty countries were constructed to allow comparisons over time and across these countries. Panel data analysis was used to estimate the relationship of national education, as defined as school years, with life expectancy. The control factors considered were numbers of practicing physicians, practicing nurses, hospital beds, and GDP.

Results

We used fixed effects of both country and time through linear regression, the coefficient of school years in relation to life expectancy was statistically significant but negative. This finding is not in accord with the hypothesis that investing in human capital through education stimulates better health outcomes.

Conclusion

Within developing countries, educational attainment is no longer keeping the same pace with life expectancy as before. Therefore, we suggest that an effective education policy should cover diverse topics, for example, balancing economic growth and mental hygiene, to improve national life expectancy.  相似文献
7.
本文通过面板数据格兰杰因果检验的方法,对我国东、中、西及东北四区的各省份服务业集聚与城市化的关联关系进行了实证分析。研究发现,虽然存在着明显的区域经济差异,但四个地区各个省份服务业集聚与城市化都表现出没有或具有单向及双向的关联关系,其原因也各有不同。从区域城市化的角度而言,各个地区要因地制宜,从而在不同的发展阶段实现服务业集聚与城市化的良性互动。  相似文献
8.
研究面板数据的聚类方法。基于二维灰色凸关联度,用二阶差商近似代替二阶导数,利用黑塞矩阵的半正定性在三维空间中定义凸度;用数据的凸性表征样本之间的相似程度,提出了三维灰色凸关联度的概念,讨论了三维灰色凸关联度的性质。实例分析表明,三维灰色凸关联度能够较好地反映面板数据的关联程度。  相似文献
9.
The purpose of this paper is to explain variations in the divorce rates across prefectures in Japan over the 20-year period between 1982 and 2002. This paper examines the various factors which may affect divorce rates including: the effects of the generosity of social welfare; the income of females relative to males; the female employment rate; the vacancy rate; a shift to no-fault divorce; and social stigma. There are three major findings of this paper. First, the generosity of a particular prefecture in approving the livelihood protection benefits (LPBs) has a statistically negative impact on the divorce rate. Moreover, social stigma has negative impacts both on the divorce rate and the generosity of social security benefits. Finally, political conservatism has a negative impact on the proportion of needy people who receive LPB. The findings of this paper imply that in order to become eligible for the social security benefits, married couples may be more likely to dissolve their marriage in those prefectures where the provision of the LPB is not so generous.  相似文献
10.
Testing the presence of serial correlation in the error terms in fixed effects regression models is important for many reasons. This paper proposes portmanteau tests based on the sum of the squares of autocorrelation estimators. This approach is a direct extension of the Box–Pierce or Ljung–Box test from single time series to panel data settings. In fixed effects regression analysis, we may estimate the autocorrelations using the within-group autocorrelations of the residuals. However, the within-group autocorrelations may be severely biased when the length of the time series is not very large compared with the cross-sectional sample size, as a result of the incidental parameters problem. We overcome this problem by using asymptotically unbiased autocorrelation estimators for long panel data recently proposed by the author. Monte Carlo simulations reveal that the proposed tests have good size properties and are powerful against a wide range of alternatives.  相似文献
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