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101.
We investigate the properties of Baker's (2008) bivariate distributions with fixed marginals and their multivariate extensions. The properties include the weak convergence to the Fréchet–Hoeffding upper bound, the product-moment convergence, as well as the dependence structures TP2 (totally positive of order 2), or MTP2 (multivariate TP2). In proving the weak convergence, a generalized local limit theorem for binomial distribution is provided. 相似文献
102.
This article provides an overview of the existing literature on panel data models with error cross-sectional dependence (CSD). We distinguish between weak and strong CSD and link these concepts to the spatial and factor structure approaches. We consider estimation under strong and weak exogeneity of the regressors for both T fixed and T large cases. Available tests for CSD and methods for determining the number of factors are discussed in detail. The finite-sample properties of some estimators and statistics are investigated using Monte Carlo experiments. 相似文献
103.
Hongshuai Dai 《统计学通讯:理论与方法》2013,42(7):1399-1410
In this article, we first introduce multifrational Riemann-Liouville Brownian sheets. Then, we show a result of approximation in law of the multifractional Riemann-Liouville Brownian sheet. The construction of these approximations is based on a sequence of I.I.D random variables. 相似文献
104.
Ahmed El Ghini 《统计学通讯:理论与方法》2013,42(21):4651-4661
For the class of autoregressive-moving average (ARMA) processes, we examine the relationship between the dual and the inverse processes. It is demonstrated that the inverse process generated by a causal and invertible ARMA (p, q) process is a causal and invertible ARMA (q, p) model. Moreover, it is established that this representation is strong if and only if the generating process is Gaussian. More precisely, it is derived that the linear innovation process of the inverse process is an all-pass model. Some examples and applications to time reversibility are given to illustrate the obtained results. 相似文献
105.
金融衍生工具风险管理研究 总被引:1,自引:0,他引:1
燕文斌 《长春工程学院学报(社会科学版)》2009,10(2):58-60
基于金融衍生工具自身特性的风险成因分析,论述了导致衍生工具风险顺周期扩张的制度因素及特点,指出企业在运用衍生工具进行风险管理的同时需要保持应有的质疑精神和谨慎的投资态度。 相似文献
106.
《统计学通讯:理论与方法》2012,41(2):430-440
AbstractIn this paper, we derive a new form of weak laws of large numbers for sub-linear expectation and establish the equivalence relation among this new form and the other two forms of weak laws of large numbers for sub-linear expectation. Moreover, we obtain the strong laws of large numbers for sub-linear expectation under a general moment condition by applying our new weak laws of large numbers. 相似文献
107.
介绍了丝带质量在线检测的测量原理,计算方法及硬件构成,测控仪可对丝带的质量参数进行了高速,非接触实时测量,并显示和传递测量数据,从而实现了对丝带质量的监控。 相似文献
108.
Michael G. Akritas Ingrid Van Keilegom 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2003,65(2):457-471
Summary. Consider a pair of random variables, both subject to random right censoring. New estimators for the bivariate and marginal distributions of these variables are proposed. The estimators of the marginal distributions are not the marginals of the corresponding estimator of the bivariate distribution. Both estimators require estimation of the conditional distribution when the conditioning variable is subject to censoring. Such a method of estimation is proposed. The weak convergence of the estimators proposed is obtained. A small simulation study suggests that the estimators of the marginal and bivariate distributions perform well relatively to respectively the Kaplan–Meier estimator for the marginal distribution and the estimators of Pruitt and van der Laan for the bivariate distribution. The use of the estimators in practice is illustrated by the analysis of a data set. 相似文献
109.
张敏 《吉林工程技术师范学院学报》2004,(8)
从多个角度分析了当前各高等学校教学与科研仪器设备管理和维修中存在的问题,并提出了重视仪器设备维修,为教学与科研服务的措施。 相似文献
110.
The problem of weak instruments is due to a very small concentration parameter. To boost the concentration parameter, we propose to increase the number of instruments to a large number or even up to a continuum. However, in finite samples, the inclusion of an excessive number of moments may be harmful. To address this issue, we use regularization techniques as in Carrasco (2012) and Carrasco and Tchuente (2014). We show that normalized regularized two-stage least squares (2SLS) and limited maximum likelihood (LIML) are consistent and asymptotically normally distributed. Moreover, our estimators are asymptotically more efficient than most competing estimators. Our simulations show that the leading regularized estimators (LF and T of LIML) work very well (are nearly median unbiased) even in the case of relatively weak instruments. An application to the effect of institutions on output growth completes the article. 相似文献