全文获取类型
收费全文 | 4424篇 |
免费 | 127篇 |
国内免费 | 45篇 |
专业分类
管理学 | 142篇 |
民族学 | 17篇 |
人才学 | 1篇 |
人口学 | 30篇 |
丛书文集 | 421篇 |
理论方法论 | 129篇 |
综合类 | 3098篇 |
社会学 | 80篇 |
统计学 | 678篇 |
出版年
2024年 | 12篇 |
2023年 | 18篇 |
2022年 | 52篇 |
2021年 | 46篇 |
2020年 | 55篇 |
2019年 | 65篇 |
2018年 | 84篇 |
2017年 | 93篇 |
2016年 | 85篇 |
2015年 | 121篇 |
2014年 | 188篇 |
2013年 | 354篇 |
2012年 | 230篇 |
2011年 | 283篇 |
2010年 | 211篇 |
2009年 | 229篇 |
2008年 | 249篇 |
2007年 | 332篇 |
2006年 | 321篇 |
2005年 | 308篇 |
2004年 | 290篇 |
2003年 | 241篇 |
2002年 | 235篇 |
2001年 | 164篇 |
2000年 | 112篇 |
1999年 | 45篇 |
1998年 | 24篇 |
1997年 | 31篇 |
1996年 | 30篇 |
1995年 | 13篇 |
1994年 | 17篇 |
1993年 | 14篇 |
1992年 | 16篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有4596条查询结果,搜索用时 15 毫秒
81.
文章基于政府主导视角,利用2006—2015年我国30个省级面板数据,构建多元回归模型,分析变量之间的关系.其结果显示,环境管制、知识产权保护与区域创新能力之间呈非线性关系,环境管制与知识产权保护同时实施对区域创新能力有显著的促进作用,且具有区域异质性.从企业生存角度出发,提出门槛效应假说,采用Hansen面板门槛回归模型进行检验.结果表明,在环境管制与知识产权保护共同发挥作用时,环境管制必须控制在合理的范围内.最后采用门槛效应回归方法找到了环境管制与知识产权保护对区域创新能力影响的门槛值,并提出相应的政策建议. 相似文献
82.
任凤辉 《长春工程学院学报(社会科学版)》2014,(2):33-35
立足于吉林省廉租房政策实施效果的全面调查数据,概述了吉林省廉租房政策实施效果,以独特的视角深入分析了廉租房政策推行过程中出现的一些亟需解决的共性问题,提出了针对性的解决对策。 相似文献
83.
《Journal of Statistical Computation and Simulation》2012,82(7):1320-1333
In reliability theory, risk analysis, renewal processes and actuarial studies, the residual lifetimes data play an important essential role in studying the conditional tail of the lifetime data. In this paper, based on some observed ordered residual Weibull data, we introduce different prediction methods for obtaining prediction intervals (PIs) of future residual lifetimes including likelihood, Wald, moments, parametric bootstrap, and highest conditional methods. Monte Carlo simulations are performed to compare the performances of the so obtained PIs and one data analysis is performed for illustration purposes. 相似文献
84.
《Journal of Statistical Computation and Simulation》2012,82(10):1235-1244
In this paper, we consider simultaneous confidence intervals for all-pairwise comparisons of treatment means in a one-way layout under heteroscedasticity. Two kinds of simultaneous intervals are provided based on the fiducial generalized pivotal quantities of the interest parameters. We prove that they both have asymptotically correct coverage. Simulation results and an example are also reported. It is concluded from calculational evidence that the second kind of simultaneous confidence intervals, which we provide, performs better than existing methods. 相似文献
85.
The high-dimensional data arises in diverse fields of sciences, engineering and humanities. Variable selection plays an important role in dealing with high dimensional statistical modelling. In this article, we study the variable selection of quadratic approximation via the smoothly clipped absolute deviation (SCAD) penalty with a diverging number of parameters. We provide a unified method to select variables and estimate parameters for various of high dimensional models. Under appropriate conditions and with a proper regularization parameter, we show that the estimator has consistency and sparsity, and the estimators of nonzero coefficients enjoy the asymptotic normality as they would have if the zero coefficients were known in advance. In addition, under some mild conditions, we can obtain the global solution of the penalized objective function with the SCAD penalty. Numerical studies and a real data analysis are carried out to confirm the performance of the proposed method. 相似文献
86.
Ngoc Khue Tran 《统计学通讯:理论与方法》2017,46(16):7942-7968
In this article, we consider an ergodic Ornstein–Uhlenbeck process with jumps driven by a Brownian motion and a compensated Poisson process, whose drift and diffusion coefficients as well as its jump intensity depend on unknown parameters. Considering the process discretely observed at high frequency, we derive the local asymptotic normality property. To obtain this result, Malliavin calculus and Girsanov’s theorem are applied to write the log-likelihood ratio in terms of sums of conditional expectations, for which a central limit theorem for triangular arrays can be applied. 相似文献
87.
马学锋 《重庆文理学院学报》2012,31(2):68-71
《刑法修正案(八)》将醉驾、飙车行为入罪,对严厉醉驾行为确实起到了震慑作用,收到了积极的社会效果。但是,对于刑法的提前介入以及该罪的内涵与外延该如何理解;社会舆论对于醉驾行为的性质还存在行为犯或者危险犯的争论:这些问题对于该罪在司法实践中的适用极其重要,值得我们深入思考。 相似文献
88.
Juan Fernández Sánchez 《Journal of nonparametric statistics》2014,26(1):129-140
In this paper, we characterise a family of bivariate copulas whose sections between the main diagonal and the border of the unit square are polynomial, generalising several families of copulas, including those with quadratic and cubic sections. We also study a measure of association and the tail dependence for this class, illustrating our results with several examples. 相似文献
89.
利用岩石薄片、铸体薄片鉴定、X–衍射、扫描电镜和压汞等资料,对白家海凸起—阜北斜坡侏罗系八道湾组的储层特征进行了研究,分析了储层的成岩作用类型、成岩演化序列、成岩作用对孔隙结构的影响及孔隙演化史。研究结果表明:八道湾组储层以岩屑砂岩为主储集空间以粒内溶孔和粒间溶孔为主,孔隙度经历了多期的演化过程,由原始的高孔隙度演化为现今低孔隙度。 相似文献
90.
In this paper, we propose a new full iteration estimation method for quantile regression (QR) of the single-index model (SIM). The asymptotic properties of the proposed estimator are derived. Furthermore, we propose a variable selection procedure for the QR of SIM by combining the estimation method with the adaptive LASSO penalized method to get sparse estimation of the index parameter. The oracle properties of the variable selection method are established. Simulations with various non-normal errors are conducted to demonstrate the finite sample performance of the estimation method and the variable selection procedure. Furthermore, we illustrate the proposed method by analyzing a real data set. 相似文献