全文获取类型
收费全文 | 72篇 |
免费 | 0篇 |
专业分类
管理学 | 5篇 |
民族学 | 1篇 |
人口学 | 3篇 |
理论方法论 | 4篇 |
社会学 | 19篇 |
统计学 | 40篇 |
出版年
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2013年 | 25篇 |
2012年 | 3篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2008年 | 1篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1987年 | 2篇 |
1983年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有72条查询结果,搜索用时 15 毫秒
1.
We propose some estimators of noncentrality parameters which improve upon usual unbiased estimators under quadratic loss. The distributions we consider are the noncentral chi-square and the noncentral F. However, we give more general results for the family of elliptically contoured distributions and propose a robust dominating estimator. 相似文献
2.
3.
A. K. Md. Ehsanes Saleh 《统计学通讯:理论与方法》2013,42(11):3145-3157
ABSTRACTThis article considers the estimation of a distribution function FX(x) based on a random sample X1, X2, …, Xn when the sample is suspected to come from a close-by distribution F0(x). The new estimators, namely the preliminary test (PTE) and Stein-type estimator (SE) are defined and compared with the “empirical distribution function” (edf) under local departure. In this case, we show that Stein-type estimators are superior to edf and PTE is superior to edf when it is close to F0(x). As a by-product similar estimators are proposed for population quantiles. 相似文献
4.
Two independent random samples are drawn from two multivariate normal populations with mean vectors μ1 and μ2 and a common
variance-covariance matrix Σ. Ahmed and Saleh (1990) considered preliminary test maximum likelihood estimator (PMLTE) for estimating μ1 based on the Hotelling's T
N
2, when it is suspected that μ1=μ2. In this paper, the PTMLE based on the Wald (W), Likelihood Ratio (LR) and Lagrangian Multiplier (LM) tests are considered. Using the quadratic risk function, the conditions of superiority of the proposed estimator for departure
parameter are derived. A max-min rule for the size of the preliminary test of significance is presented. It is demonstrated
that the PTMLE based on W test produces the highest minimum guaranteed efficiencies compared to UMLE among the three test procedures. 相似文献
5.
This work emerged from the need to better plan the daily work of 29 travelling service agents, who provide 1090 services to 412 customers in 283 sites, on daily average. A handy and flexible tool was developed and is presented herein. A major contribution of this study is an explicit consideration of the multi-dimensional nature of the problem by the inclusion of workload balancing, which may stand in conflict to cost minimisation. Further, the geographical distribution of the demand is highly irregular. Therefore, two load measures are required and balanced. This required to fitting a proper planning scheme. The planning tool has been applied successfully by the commercial service provider. Improvements in the order of 20% and more were obtained in key performance measures. Moreover, cost reductions, service improvement and load balance were obtained simultaneously: the standard deviations of the service times and working day’s duration were reduced by 18 and 58%, respectively. This enables to reduce the number of agents with no significant harm in performance. Additional practical advantages of the proposed tool are also discussed and demonstrated, for example, the ability to cope with geographical distributions and the flexibility to respond to daily variations in demand. 相似文献
6.
This paper, summarizes the lessons learned in this special issue of Habitat International on Planning Issues in the Middle East. After summarizing the highlights of the papers included in the issue, the paper looks ahead to the challenges facing the region's planners. These include coping with the rapid growth of cities, developing stronger planning institutions, integrating events in urban areas with the rural hinterlands, incorporating consultation with the public in the planning processes and meeting the inevitable challenges that will accompany globalization. 相似文献
7.
This paper considers alternative estimators of the intercept parameter of the linear regression model with normal error when
uncertain non-sample prior information about the value of the slope parameter is available. The maximum likelihood, restricted,
preliminary test and shrinkage estimators are considered. Based on their quadratic biases and mean square errors the relative
performances of the estimators are investigated. Both analytical and graphical comparisons are explored. None of the estimators
is found to be uniformly dominating the others. However, if the non-sample prior information regarding the value of the slope
is not too far from its true value, the shrinkage estimator of the intercept parameter dominates the rest of the estimators. 相似文献
8.
Judith A. Fortney Saad Gadalla Saneya Saleh Inne Susanti Malcolm Potts Susan M. Rogers 《Population research and policy review》1987,6(2):137-148
Data on cause of death are deficient for most developing countries. Nevertheless, it is important for policy makers to have access to such information to plan the use of resources and to evaluate health programs. In this study, deaths among women of reproductive age (15 to 49) in two areas in developing countries were located, and family members were interviewed. Local physicians reviewed the completed interviews and determined the cause of death.Complications of pregnancy and childbirth were the cause of 23% of the deaths in Menoufia, Egypt and Bali, Indonesia. In Egypt, the first cause of death was circulatory system disease (28%), followed by complications of pregnancy and childbirth (23%), and trauma (14%, primarily burns). In Indonesia, complications of pregnancy and childbirth was the first cause of death, followed by infectious disease (22%, primarily tuberculosis), and circulatory system disease (13%).Although the method of data collection was unorthodox, findings for Menoufia are comparable to data from other sources for the country as a whole. There are few data with which to compare our findings for Bali, but their similarity to the data from the Egyptian study lends credence to their quality. 相似文献
9.
10.
In an AR (p)-model, least-squares estimation of the parameters is considered when it is suspected that the parameters may belong to a linear subspace and the estimated covariance matrix is ill-conditioned. Accordingly, we define five estimators and study their properties in an asymptotic setup to discover dominance properties based on asymptotic distributional bias (ADB), MSE (ADMSE) matrices, and under quadratic risks (ADQR). 相似文献