全文获取类型
收费全文 | 838篇 |
免费 | 36篇 |
国内免费 | 8篇 |
专业分类
管理学 | 64篇 |
民族学 | 1篇 |
人口学 | 6篇 |
丛书文集 | 36篇 |
理论方法论 | 29篇 |
综合类 | 294篇 |
社会学 | 33篇 |
统计学 | 419篇 |
出版年
2024年 | 1篇 |
2023年 | 23篇 |
2022年 | 10篇 |
2021年 | 21篇 |
2020年 | 23篇 |
2019年 | 28篇 |
2018年 | 21篇 |
2017年 | 27篇 |
2016年 | 22篇 |
2015年 | 26篇 |
2014年 | 38篇 |
2013年 | 165篇 |
2012年 | 57篇 |
2011年 | 28篇 |
2010年 | 32篇 |
2009年 | 36篇 |
2008年 | 39篇 |
2007年 | 33篇 |
2006年 | 28篇 |
2005年 | 29篇 |
2004年 | 22篇 |
2003年 | 24篇 |
2002年 | 16篇 |
2001年 | 18篇 |
2000年 | 18篇 |
1999年 | 12篇 |
1998年 | 11篇 |
1997年 | 8篇 |
1996年 | 10篇 |
1995年 | 11篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有882条查询结果,搜索用时 0 毫秒
91.
In weighted moment condition models, we show a subtle link between identification and estimability that limits the practical usefulness of estimators based on these models. In particular, if it is necessary for (point) identification that the weights take arbitrarily large values, then the parameter of interest, though point identified, cannot be estimated at the regular (parametric) rate and is said to be irregularly identified. This rate depends on relative tail conditions and can be as slow in some examples as n−1/4. This nonstandard rate of convergence can lead to numerical instability and/or large standard errors. We examine two weighted model examples: (i) the binary response model under mean restriction introduced by Lewbel (1997) and further generalized to cover endogeneity and selection, where the estimator in this class of models is weighted by the density of a special regressor, and (ii) the treatment effect model under exogenous selection (Rosenbaum and Rubin (1983)), where the resulting estimator of the average treatment effect is one that is weighted by a variant of the propensity score. Without strong relative support conditions, these models, similar to well known “identified at infinity” models, lead to estimators that converge at slower than parametric rate, since essentially, to ensure point identification, one requires some variables to take values on sets with arbitrarily small probabilities, or thin sets. For the two models above, we derive some rates of convergence and propose that one conducts inference using rate adaptive procedures that are analogous to Andrews and Schafgans (1998) for the sample selection model. 相似文献
92.
立足培养规范程序促进成长--积极慎重地做好大学生党员发展工作思考 总被引:2,自引:0,他引:2
本文针对高校党组织在积极加大发展党员工作力度的基础上,如何在发展工作中把好质量关进行了探讨.介绍了我校在抓好入党积极分子的教育培训,规范发展党员工作程序,以支部建设促进党员继续教育等工作中的具体做法和成功经验. 相似文献
93.
94.
Dankmar Bohning 《统计学通讯:理论与方法》2013,42(22):2645-2653
This note gives a condition which ensures convergence to an optimum of an algorithm suggested by Silvey, Titterington and Torsney (19 78) in the optimal design context. 相似文献
95.
Christopher Jennison 《统计学通讯:理论与方法》2013,42(24):2887-2896
The problem of selecting the Bernoulli population which has the highest "success" probability is considered. It has been noted in several articles that the probability of a correct selection is the same, uniformly in the Bernoulli p-vector (P1,P2,….,Pk), for two or more different selection procedures. We give a general theorem which explains this phenomenon. An application of particular interest arises when "strong" curtailment of a single-stage procedure (as introduced by Bechhofer and Kulkarni (1982a) )is employed; the corresponding result for "weak" curtailment of a single-stage procedure needs no proof. The use of strong curtailment in place of weak curtailment requires no more (and usually many less) observations to achieve the same. 相似文献
96.
97.
Susan M. Sanchez 《统计学通讯:理论与方法》2013,42(11):4275-4301
Although a large number of selection procedures have been published in the statistics literature, the selection approach has received only limited use in applications. One drawback to the use of such procedures has been the lack of parameter estimates, which prevents quantitative comparisons among the treatments. To partially address this criticism, we present a general method for constructing unbiased estimators of the success probabilities after the termination of a sequential experiment involving two or more Bernoulli populations. Some theoretical properties are presented, and examples are provided for several different selection procedures. 相似文献
98.
99.
The problem of constructing a confidence interval of ‘preassigned width and coverage probability’ considered by Costanza/ Hamdy and Son(1986) is further analyzed. Several multi-stage estimation procedures [ like, purely sequential, accelerated sequential and three-stage procedures ] are utilized to deal with the same estimation problem. The relative advantages and disadvantages of these procedures are discussed. 相似文献
100.
《统计学通讯:理论与方法》2013,42(8-9):1789-1810
Mudholkar and Srivastava [1]adapted Mudholkar and Subbaiah's [2]modified stepwise procedure, using the trimmed means in place of the means and appropriate studentization, to construct robust tests for the significance of a mean vector. They concluded that the robust alternatives provide excellent type I error control, and a substantial gain in power over Hotelling's T 2test in case of heavy tailed populations without significant loss of power when the population is normal. In this paper we adapt the modified stepwise approach to construct simple tests for the significance of the orthant constrained mean vector of a p-variate normal population with unknown covariance matrix, and also for constructing robust tests without assuming normality. The simple normal theory tests have exact type I error, whereas the robust tests provide a reasonably type I error control and substantial power advantage over Perlman's [3]likelihood ratio test. 相似文献