全文获取类型
收费全文 | 7207篇 |
免费 | 114篇 |
国内免费 | 33篇 |
专业分类
管理学 | 317篇 |
民族学 | 26篇 |
人口学 | 142篇 |
丛书文集 | 230篇 |
理论方法论 | 108篇 |
综合类 | 1765篇 |
社会学 | 72篇 |
统计学 | 4694篇 |
出版年
2024年 | 5篇 |
2023年 | 29篇 |
2022年 | 63篇 |
2021年 | 58篇 |
2020年 | 114篇 |
2019年 | 206篇 |
2018年 | 231篇 |
2017年 | 455篇 |
2016年 | 148篇 |
2015年 | 170篇 |
2014年 | 247篇 |
2013年 | 2036篇 |
2012年 | 548篇 |
2011年 | 290篇 |
2010年 | 212篇 |
2009年 | 243篇 |
2008年 | 260篇 |
2007年 | 256篇 |
2006年 | 219篇 |
2005年 | 228篇 |
2004年 | 183篇 |
2003年 | 171篇 |
2002年 | 165篇 |
2001年 | 151篇 |
2000年 | 127篇 |
1999年 | 75篇 |
1998年 | 64篇 |
1997年 | 48篇 |
1996年 | 41篇 |
1995年 | 33篇 |
1994年 | 26篇 |
1993年 | 30篇 |
1992年 | 27篇 |
1991年 | 25篇 |
1990年 | 26篇 |
1989年 | 24篇 |
1988年 | 15篇 |
1987年 | 17篇 |
1986年 | 8篇 |
1985年 | 11篇 |
1984年 | 13篇 |
1983年 | 15篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 7篇 |
1976年 | 4篇 |
1975年 | 4篇 |
排序方式: 共有7354条查询结果,搜索用时 15 毫秒
71.
72.
Ying-Ying Zhang Ze-Yu Wang Zheng-Min Duan Wen Mi 《Journal of Statistical Computation and Simulation》2019,89(16):3061-3074
For the hierarchical Poisson and gamma model, we calculate the Bayes posterior estimator of the parameter of the Poisson distribution under Stein's loss function which penalizes gross overestimation and gross underestimation equally and the corresponding Posterior Expected Stein's Loss (PESL). We also obtain the Bayes posterior estimator of the parameter under the squared error loss and the corresponding PESL. Moreover, we obtain the empirical Bayes estimators of the parameter of the Poisson distribution with a conjugate gamma prior by two methods. In numerical simulations, we have illustrated: The two inequalities of the Bayes posterior estimators and the PESLs; the moment estimators and the Maximum Likelihood Estimators (MLEs) are consistent estimators of the hyperparameters; the goodness-of-fit of the model to the simulated data. The numerical results indicate that the MLEs are better than the moment estimators when estimating the hyperparameters. Finally, we exploit the attendance data on 314 high school juniors from two urban high schools to illustrate our theoretical studies. 相似文献
73.
This article suggests an efficient method of estimating a rare sensitive attribute which is assumed following Poisson distribution by using three-stage unrelated randomized response model instead of the Land et al. model (2011) when the population consists of some different sized clusters and clusters selected by probability proportional to size(:pps) sampling. A rare sensitive parameter is estimated by using pps sampling and equal probability two-stage sampling when the parameter of a rare unrelated attribute is assumed to be known and unknown.We extend this method to the case of stratified population by applying stratified pps sampling and stratified equal probability two-stage sampling. An empirical study is carried out to show the efficiency of the two proposed methods when the parameter of a rare unrelated attribute is assumed to be known and unknown. 相似文献
74.
This paper revisits two bivariate Pareto models for fitting competing risks data. The first model is the Frank copula model, and the second one is a bivariate Pareto model introduced by Sankaran and Nair (1993). We discuss the identifiability issues of these models and develop the maximum likelihood estimation procedures including their computational algorithms and model-diagnostic procedures. Simulations are conducted to examine the performance of the maximum likelihood estimation. Real data are analyzed for illustration. 相似文献
75.
76.
AbstractGrubbs and Weaver (1947) suggest a minimum-variance unbiased estimator for the population standard deviation of a normal random variable, where a random sample is drawn and a weighted sum of the ranges of subsamples is calculated. The optimal choice involves using as many subsamples of size eight as possible. They verified their results numerically for samples of size up to 100, and conjectured that their “rule of eights” is valid for all sample sizes. Here we examine the analogous problem where the underlying distribution is exponential and find that a “rule of fours” yields optimality and prove the result rigorously. 相似文献
77.
78.
清代广西三界庙地理分布与三界神信仰探析 总被引:1,自引:0,他引:1
三界庙在清代广西各府中都有分布,主要集中分布在南宁、浔州、郁林、平乐、梧州等五府(州),呈现出一种沿着西江流域自东向西递减的分布规律,在郁江两岸分布最为密集。清代广西已经初步形成了三界神祭祀圈,而这种祭祀圈的出现与三界神的现实功利色彩有着密不可分的关系。 相似文献
79.
浅析中国土族人口分布格局及其社会发展 总被引:2,自引:0,他引:2
人口分布格局,既是人在空间分布上呈现出来的地理状态,又是许多附着于分布环境上的社会人文变量的外在表现,因此对其进行研究具有探索自然和认识社会的双重意义。本文就中国土族人口的分布格局进行探讨,从历史和现实两方面分析了形成这种分布的原因,并在此基础上探讨了与人口分布格局密切相关的人口城市化、人口流动、人口素质提高、区域经济发展等社会热点问题,以期为政府政策的制定提供可靠的依据。 相似文献
80.
In the present article, we discuss the regression of a point on the surface of a unit sphere in d dimensions given a point on the surface of a unit sphere in p dimensions, where p may not be equal to d. Point projection is added to the rotation and linear transformation for regression link function. The identifiability of the model is proved. Then, parameter estimation in this set up is discussed. Simulation studies and data analyses are done to illustrate the model. 相似文献