全文获取类型
收费全文 | 640篇 |
免费 | 21篇 |
国内免费 | 1篇 |
专业分类
管理学 | 40篇 |
人口学 | 22篇 |
丛书文集 | 24篇 |
理论方法论 | 27篇 |
综合类 | 249篇 |
社会学 | 17篇 |
统计学 | 283篇 |
出版年
2023年 | 4篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 19篇 |
2019年 | 17篇 |
2018年 | 18篇 |
2017年 | 26篇 |
2016年 | 22篇 |
2015年 | 19篇 |
2014年 | 20篇 |
2013年 | 125篇 |
2012年 | 34篇 |
2011年 | 34篇 |
2010年 | 25篇 |
2009年 | 19篇 |
2008年 | 35篇 |
2007年 | 30篇 |
2006年 | 25篇 |
2005年 | 22篇 |
2004年 | 22篇 |
2003年 | 24篇 |
2002年 | 15篇 |
2001年 | 13篇 |
2000年 | 12篇 |
1999年 | 8篇 |
1998年 | 11篇 |
1997年 | 6篇 |
1996年 | 7篇 |
1995年 | 9篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 10篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有662条查询结果,搜索用时 31 毫秒
21.
N. Mukhopadhyay 《统计学通讯:理论与方法》2013,42(8):2471-2506
The literature on sequential estimation problems for negative exponential populations has been reviewed here, We attempt to bring in all the published and unpublished materials known to us in a fairly coherent fashion. Both the concepts and theoretical findings are discussed. 相似文献
22.
The purpose of the article is, in case of one sample, to obtain tests concerning the parameter in the power series distribution in one parameter using Ku11back-Leibier information measure. The class of power series distibutions contains a host of discrete distributions. Ve illustrate the general results obtained in case of the geometric distibution. 相似文献
23.
24.
由于螺杆泵几何结构及流体流动状态较为复杂,其压力分布和速度等特性很难用数学解析法来分析计算。本文利用参数化设计模块建立双螺杆泵Q形对称型螺杆三维模型,构建双螺杆流道的流场分析模型,运用有限元分析方法得出了双螺杆泵流道内压力场和速度场分布规律。结果表明:流体在流道中的流速分布具有规律性,整个流道的流场速度高低交替变化,在螺杆与衬套间隙处的流动为层流,螺旋面接触区内的流动为复杂的湍流,离螺杆啮合区近的螺旋槽内易发生涡流。本研究结果对于了解双螺杆泵螺杆工况下的性能情况具有重要的参考价值。 相似文献
25.
26.
基于城乡结合部老旧社区治理的嵌入性特征,将嵌入性理论视角与存量规划新常态下老旧社区的治理创新诉求相关联,从理论和实践双重维度研究阐述城乡结合部老旧社区嵌入式治理的生成背景、行动策略与创新路径。现阶段,多元治理主体在助力城乡结合部老旧社区治理与改造过程中,为满足老旧社区基础性改造需求、超越传统治理的行政化倾向、实现内源性发展目标,业已形成资源型嵌入、功能型嵌入和融合型嵌入三种行动策略,但受复杂的治理情境和滞后的治理后管理机制的影响易面临适应性挑战。应通过激发社区居民主体能动性、推进社会资本再组织化、完善治理后管理机制等具体路径,推进城乡结合部老旧社区嵌入式治理的可持续发展。 相似文献
27.
It is well known that many industrial experiments have split‐plot structures. Compared to completely randomised experiments, split‐plot designs are more economical and thus have received much attention among researchers. Much work has been done for two‐level split‐plot designs. In this article, we consider split‐plot designs with factors of three, more than three, or mixed levels and with both qualitative and quantitative factors. We show that if two designs with both qualitative and quantitative factors are geometrically isomorphic, then their generalised wordlength patterns are identical. Three design scenarios are considered for optimal designs. The corresponding wordlength patterns are defined and the minimum aberration mixed‐level split‐plot designs having 18 and 36 runs are tabulated. 相似文献
28.
We consider spatial point processes with a pair correlation function, which depends only on the lag vector between a pair of points. Our interest is in statistical models with a special kind of ‘structured’ anisotropy: the pair correlation function is geometric anisotropic if it is elliptical but not spherical. In particular, we study Cox process models with an elliptical pair correlation function, including shot noise Cox processes and log Gaussian Cox processes, and we develop estimation procedures using summary statistics and Bayesian methods. Our methodology is illustrated on real and synthetic datasets of spatial point patterns. 相似文献
29.
Because outliers and leverage observations unduly affect the least squares regression, the identification of influential observations is considered an important and integrai part of the analysis. However, very few techniques have been developed for the residual analysis and diagnostics for the minimum sum of absolute errors, L1 regression. Although the L1 regression is more resistant to the outliers than the least squares regression, it appears that outliers (leverage) in the predictor variables may affect it. In this paper, our objective is to develop an influence measure for the L1 regression based on the likelihood displacement function. We illustrate the proposed influence measure with examples. 相似文献
30.
A more general methodology for fitting global cross-ratio models for discrete longitudinal responses
M. C. Pardo 《Statistics》2013,47(5):1071-1091
In this paper, we focus on repeated measurement problems, comprising an interesting research area in statistics. We study longitudinal data which arise when outcomes are observed repeatedly on each experimental subject at several points. We focus on a marginal approach for this type of data with lack of independence among the observations proposed by Dale [Global cross-ratio models for bivariate, discrete, ordered responses. Biometrics. 1986;42(4):909–917] for bivariate, discrete, ordered responses. We propose an alternative estimation based on divergence measures to the full likelihood method proposed in that paper. Finally, a wide simulation study and a data example that illustrates the new methodology is provided. 相似文献