全文获取类型
收费全文 | 15728篇 |
免费 | 665篇 |
国内免费 | 205篇 |
专业分类
管理学 | 1861篇 |
劳动科学 | 2篇 |
民族学 | 63篇 |
人才学 | 3篇 |
人口学 | 314篇 |
丛书文集 | 777篇 |
理论方法论 | 354篇 |
综合类 | 7395篇 |
社会学 | 525篇 |
统计学 | 5304篇 |
出版年
2024年 | 19篇 |
2023年 | 115篇 |
2022年 | 201篇 |
2021年 | 235篇 |
2020年 | 346篇 |
2019年 | 454篇 |
2018年 | 511篇 |
2017年 | 652篇 |
2016年 | 541篇 |
2015年 | 555篇 |
2014年 | 881篇 |
2013年 | 2106篇 |
2012年 | 1174篇 |
2011年 | 1018篇 |
2010年 | 841篇 |
2009年 | 829篇 |
2008年 | 909篇 |
2007年 | 881篇 |
2006年 | 809篇 |
2005年 | 683篇 |
2004年 | 565篇 |
2003年 | 481篇 |
2002年 | 419篇 |
2001年 | 362篇 |
2000年 | 229篇 |
1999年 | 176篇 |
1998年 | 95篇 |
1997年 | 98篇 |
1996年 | 72篇 |
1995年 | 62篇 |
1994年 | 45篇 |
1993年 | 39篇 |
1992年 | 37篇 |
1991年 | 40篇 |
1990年 | 24篇 |
1989年 | 18篇 |
1988年 | 15篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1985年 | 13篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 5篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
321.
In modeling disease transmission, contacts are assumed to have different infection rates. A proper simulation must model the heterogeneity in the transmission rates. In this article, we present a computationally efficient algorithm that can be applied to a population with heterogeneous transmission rates. We conducted a simulation study to show that the algorithm is more efficient than other algorithms for sampling the disease transmission in a subset of the heterogeneous population. We use a valid stochastic model of pandemic influenza to illustrate the algorithm and to estimate the overall infection attack rates of influenza A (H1N1) in a Canadian city. 相似文献
322.
Joon Jin Song 《统计学通讯:模拟与计算》2017,46(5):4154-4160
Randomized response models have been used to estimate a population proportion of a sensitive attribute. A randomized device is typically employed to protect respondent's privacy in a survey. In addition, an unrelated question is asked to improve the statistical efficiency. In this article, we propose Bayesian estimation of rare sensitive attribute using randomized response technique, which includes a rare unrelated attribute. Two cases are considered, the proportion of a rare unrelated attribute is known and unknown. A simulation study is conducted to assess the performance of the models using mean absolute error and coverage probability. The results show that the performance depends on the parameters and is robust to priors. 相似文献
323.
This paper considers constructing a new confidence interval for the slope parameter in the structural errors-in-variables model with known error variance associated with the regressors. Existing confidence intervals are so severely affected by Gleser–Hwang effect that they are subject to have poor empirical coverage probabilities and unsatisfactory lengths. Moreover, these problems get worse with decreasing reliability ratio which also result in more frequent absence of some existing intervals. To ease these issues, this paper presents a fiducial generalized confidence interval which maintains the correct asymptotic coverage. Simulation results show that this fiducial interval is slightly conservative while often having average length comparable or shorter than the other methods. Finally, we illustrate these confidence intervals with two real data examples, and in the second example some existing intervals do not exist. 相似文献
324.
《Journal of Statistical Computation and Simulation》2012,82(4):451-461
In this article, we derive general matrix formulae for second-order biases of maximum likelihood estimators (MLEs) in a class of heteroscedastic symmetric nonlinear regression models, thus generalizing some results in the literature. This class of regression models includes all symmetric continuous distributions, and has a wide range of practical applications in various fields such as engineering, biology, medicine and economics, among others. The variety of distributions with different kurtosis coefficients than the normal may give more flexibility in the choice of an appropriate distribution, particularly to accommodate outlying and influential observations. We derive a joint iterative process for estimating the mean and dispersion parameters. We also present simulation studies for the biases of the MLEs. 相似文献
325.
326.
《Journal of Statistical Computation and Simulation》2012,82(2-4):291-313
The construction and enumeration of (0, 1)-matrices with given line-sums is described for the rectangular cases often encountered in applications. Improved approximations are provided for the number of such matrices. Some new enumeration results for semi-regular bipartite graphs are included, and the related category of the quasi-semiregular bipartite graphs is recognized. The range of certain elements of products of a (0, I)-matrix is considered as a function of the line-sums. This, in turn, is related to the range in the numbers of interchanges available. Improvements in statistical practice that come from these constructions and enumerations are described. 相似文献
327.
从基本的菲利普斯曲线理论出发,提出了新的适应性预期模型,并以此为基础建立附加预期的菲利普斯曲线方程,进而估计出我国近年来的自然失业率水平,由此证明了菲利普斯曲线在我国的有效性,并描述了预期因素对实际通货膨胀水平的影响。最后结合实证分析结果提出解决我国通货膨胀和失业问题的建议,如保证货币政策的连贯性、加强信息披露、解决结构性失业问题等。 相似文献
328.
In this article, we consider a nonparametric regression model with replicated observations based on the dependent error’s structure, for exhibiting dependence among the units. The wavelet procedures are developed to estimate the regression function. The moment consistency, the strong consistency, strong convergence rate and asymptotic normality of wavelet estimator are established under suitable conditions. A simulation study is undertaken to assess the finite sample performance of the proposed method. 相似文献
329.
郝铁川 《云南大学学报(社会科学版)》2017,16(2):115-123
当前中国特色社会主义法治与孙中山先生的“训政”相比,两者相似之处在于都坚持一党执政,并将此视为法治现代化进程中不可或缺的一个阶段性特征;不同之处在于两者的内容和性质发生了根本变化。内容的变化主要体现在社会基础发生巨大变化和民主成分获得较大增长;性质的变化主要体现在它不再是资本主义而是中国特色社会主义性质。以一党长期执政、不搞西方多党竞争为特点的中国特色社会主义法治长期存在的原因是:中国属于后发的政府主导的赶超型现代化国家,没有形成橄榄形社会结构,需要通过建立能够集中力量办大事的政治体制,实现中国的“富”与“强”。 相似文献
330.
Maengseok Noh Johan H.L. Oud Toni Toharudin 《Journal of Statistical Computation and Simulation》2019,89(9):1555-1573
Factor models, structural equation models (SEMs) and random-effect models share the common feature that they assume latent or unobserved random variables. Factor models and SEMs allow well developed procedures for a rich class of covariance models with many parameters, while random-effect models allow well developed procedures for non-normal models including heavy-tailed distributions for responses and random effects. In this paper, we show how these two developments can be combined to result in an extremely rich class of models, which can be beneficial to both areas. A new fitting procedures for binary factor models and a robust estimation approach for continuous factor models are proposed. 相似文献