全文获取类型
收费全文 | 8696篇 |
免费 | 159篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1152篇 |
民族学 | 46篇 |
人口学 | 881篇 |
丛书文集 | 36篇 |
教育普及 | 1篇 |
理论方法论 | 802篇 |
综合类 | 98篇 |
社会学 | 4318篇 |
统计学 | 1522篇 |
出版年
2023年 | 49篇 |
2020年 | 120篇 |
2019年 | 182篇 |
2018年 | 202篇 |
2017年 | 299篇 |
2016年 | 221篇 |
2015年 | 153篇 |
2014年 | 202篇 |
2013年 | 1506篇 |
2012年 | 261篇 |
2011年 | 253篇 |
2010年 | 174篇 |
2009年 | 165篇 |
2008年 | 180篇 |
2007年 | 180篇 |
2006年 | 203篇 |
2005年 | 183篇 |
2004年 | 182篇 |
2003年 | 164篇 |
2002年 | 181篇 |
2001年 | 199篇 |
2000年 | 190篇 |
1999年 | 207篇 |
1998年 | 157篇 |
1997年 | 151篇 |
1996年 | 153篇 |
1995年 | 129篇 |
1994年 | 120篇 |
1993年 | 125篇 |
1992年 | 138篇 |
1991年 | 145篇 |
1990年 | 144篇 |
1989年 | 156篇 |
1988年 | 98篇 |
1987年 | 125篇 |
1986年 | 115篇 |
1985年 | 129篇 |
1984年 | 106篇 |
1983年 | 112篇 |
1982年 | 86篇 |
1981年 | 92篇 |
1980年 | 83篇 |
1979年 | 95篇 |
1978年 | 91篇 |
1977年 | 65篇 |
1976年 | 73篇 |
1975年 | 69篇 |
1974年 | 61篇 |
1973年 | 57篇 |
1971年 | 44篇 |
排序方式: 共有8856条查询结果,搜索用时 15 毫秒
201.
Social Indicators Research - In this study, we aim at clarifying the role of economic inequality on the subjective well-being of individuals. For this purpose, we use more than 180,000 individuals... 相似文献
202.
203.
Recent work on point processes includes studying posterior convergence rates of estimating a continuous intensity function. In this article, convergence rates for estimating the intensity function and change‐point are derived for the more general case of a piecewise continuous intensity function. We study the problem of estimating the intensity function of an inhomogeneous Poisson process with a change‐point using non‐parametric Bayesian methods. An Markov Chain Monte Carlo (MCMC) algorithm is proposed to obtain estimates of the intensity function and the change‐point which is illustrated using simulation studies and applications. The Canadian Journal of Statistics 47: 604–618; 2019 © 2019 Statistical Society of Canada 相似文献
204.
B. Ceranka 《统计学通讯:理论与方法》2019,48(6):1470-1480
In the paper, some issues concerned with the determining spring balance weighing designs satisfying the criterion of D-optimality under the assumption measurement errors are uncorrelated and they have the same variances are discussed. In addition, highly D-efficient spring balance weighing designs are also considered. Some conditions under which any spring balance weighing design is regular D-optimal or highly D-efficient are proved. What is more, new construction methods of regular D-optimal and highly D-efficient spring balance weighing designs are presented. 相似文献
205.
The main objective of this work is to evaluate the performance of confidence intervals, built using the deviance statistic, for the hyperparameters of state space models. The first procedure is a marginal approximation to confidence regions, based on the likelihood test, and the second one is based on the signed root deviance profile. Those methods are computationally efficient and are not affected by problems such as intervals with limits outside the parameter space, which can be the case when the focus is on the variances of the errors. The procedures are compared to the usual approaches existing in the literature, which includes the method based on the asymptotic distribution of the maximum likelihood estimator, as well as bootstrap confidence intervals. The comparison is performed via a Monte Carlo study, in order to establish empirically the advantages and disadvantages of each method. The results show that the methods based on the deviance statistic possess a better coverage rate than the asymptotic and bootstrap procedures. 相似文献
206.
Brizzi Francesco Birrell Paul J. Plummer Martyn T. Kirwan Peter Brown Alison E. Delpech Valerie C. Gill O. Noel De Angelis Daniela 《Lifetime data analysis》2019,25(4):757-780
Lifetime Data Analysis - CD4-based multi-state back-calculation methods are key for monitoring the HIV epidemic, providing estimates of HIV incidence and diagnosis rates by disentangling their... 相似文献
207.
D. C. Wickramarachchi B. L. Robertson M. Reale C. J. Price J. A. Brown 《Australian & New Zealand Journal of Statistics》2019,61(3):380-391
We present an algorithm for learning oblique decision trees, called HHCART(G). Our decision tree combines learning concepts from two classification trees, HHCART and Geometric Decision Tree (GDT). HHCART(G) is a simplified HHCART algorithm that uses linear structure in the training examples, captured by a modified GDT angle bisector, to define splitting directions. At each node, we reflect the training examples with respect to the modified angle bisector to align this linear structure with the coordinate axes. Searching axis parallel splits in this reflected feature space provides an efficient and effective way of finding oblique splits in the original feature space. Our method is much simpler than HHCART because it only considers one reflected feature space for node splitting. HHCART considers multiple reflected feature spaces for node splitting making it more computationally intensive to build. Experimental results show that HHCART(G) is an effective classifier, producing compact trees with similar or better results than several other decision trees, including GDT and HHCART trees. 相似文献
208.
Rebecca L. C. Taylor Scott Kaplan Sofia B. Villas‐Boas Kevin Jung 《Economic inquiry》2019,57(3):1480-1496
We examine how soda sales changed due to the campaign attention and election outcome of a local excise tax on sugar‐sweetened beverages. Using panel data of beverage sales from university retailers in Berkeley, California, we estimate that soda purchases relative to control beverages significantly dropped immediately after the election, months before the tax was implemented in the city of Berkeley or on campus. Supplemental scanner data from off‐campus retailers reveal this result is not unique to the university setting. Our findings suggest soda tax media coverage and election outcomes can have larger effects on purchasing behavior than the tax itself. (JEL D12, H20, C23, I38, Q18) 相似文献
209.
Cameron C. Brown Zenova Williams Jared A. Durtschi 《Journal of marital and family therapy》2019,45(4):650-667
Minimal research has examined interracial couples’ relationship satisfaction and dissolution patterns over time. Using dyadic data across 8 years, we examined potential differences in relationship quality trajectories through latent growth curve modeling with 1,336 couples as well as differential risks for relationship dissolution through logistic regression between same‐race and interracial relationships using a different subset of 2,370 couples. Results indicated that women in interracial relationships were significantly lower in initial relationship quality than women in same‐race relationships. Further, interracial couples of Black‐Hispanic partnerings were twice as likely to separate across 8 years than same‐race couples. These results suggest that despite interracial relationships not substantively differing from same‐race couples in trajectories of relationship quality, specific Black‐Hispanic interracial couples are at a higher risk of eventual separation. 相似文献
210.
Jennifer J. Lambert‐Shute Hoa N. Nguyen Paul W. Peterson Annisa B. Pirasteh 《Journal of marital and family therapy》2019,45(2):256-274
In this content analysis, researchers examine articles published from 2000 to 2015 in three family therapy journals, yielding a total of 948 empirical articles. The purpose is to provide an overview of the research being published, assess who is publishing, and investigate the current state of clinical effectiveness research in marriage and family therapy (MFT). Most first authors were affiliated with MFT programs and primarily included diversity and couples in their research. There was a significant increase of research on clinical process—though the number of clinical outcome studies held steady. There were no significant changes with regard to research funding. Implications support the use of innovative research methods to provide evidence of clinical effectiveness. 相似文献