全文获取类型
收费全文 | 21425篇 |
免费 | 280篇 |
专业分类
管理学 | 3116篇 |
民族学 | 144篇 |
人才学 | 1篇 |
人口学 | 3521篇 |
丛书文集 | 60篇 |
教育普及 | 1篇 |
理论方法论 | 1436篇 |
现状及发展 | 1篇 |
综合类 | 418篇 |
社会学 | 9610篇 |
统计学 | 3397篇 |
出版年
2023年 | 76篇 |
2021年 | 56篇 |
2020年 | 163篇 |
2019年 | 221篇 |
2018年 | 1887篇 |
2017年 | 1986篇 |
2016年 | 1326篇 |
2015年 | 214篇 |
2014年 | 271篇 |
2013年 | 1956篇 |
2012年 | 694篇 |
2011年 | 1440篇 |
2010年 | 1284篇 |
2009年 | 1024篇 |
2008年 | 1079篇 |
2007年 | 1250篇 |
2006年 | 245篇 |
2005年 | 479篇 |
2004年 | 494篇 |
2003年 | 425篇 |
2002年 | 327篇 |
2001年 | 286篇 |
2000年 | 294篇 |
1999年 | 271篇 |
1998年 | 180篇 |
1997年 | 170篇 |
1996年 | 193篇 |
1995年 | 163篇 |
1994年 | 133篇 |
1993年 | 150篇 |
1992年 | 167篇 |
1991年 | 145篇 |
1990年 | 156篇 |
1989年 | 181篇 |
1988年 | 161篇 |
1987年 | 136篇 |
1986年 | 148篇 |
1985年 | 167篇 |
1984年 | 165篇 |
1983年 | 156篇 |
1982年 | 121篇 |
1981年 | 105篇 |
1980年 | 102篇 |
1979年 | 137篇 |
1978年 | 88篇 |
1977年 | 87篇 |
1976年 | 87篇 |
1975年 | 80篇 |
1974年 | 80篇 |
1973年 | 73篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
Michael Kohler 《AStA Advances in Statistical Analysis》2008,92(2):153-178
American options in discrete time can be priced by solving optimal stopping problems. This can be done by computing so-called
continuation values, which we represent as regression functions defined recursively by using the continuation values of the
next time step. We use Monte Carlo to generate data, and then we apply smoothing spline regression estimates to estimate the
continuation values from these data. All parameters of the estimate are chosen data dependent. We present results concerning
consistency and the estimates’ rate of convergence. 相似文献
113.
This paper proposes an experimental test to evaluate the performance of the serial cost sharing rule, originally proposed
by Shenker [Sigmetrics, 241–242 (1990)] and then analyzed by Moulin and Shenker [Econometrica 60, 1009–1037 (1992)]. We report
measures of the performance and efficiency of the serial mechanism by comparing the choices and payoffs attained by the subjects
to the expected equilibrium allocations. Experimental evidence shows that learning is needed for the subjects to converge
to the equilibrium strategy. However, in terms of efficiency, the serial mechanism leads to almost efficient allocations. 相似文献
114.
Ranked set sampling is a sampling approach that leads to improved statistical inference in situations where the units to be sampled can be ranked relative to each other prior to formal measurement. This ranking may be done either by subjective judgment or according to an auxiliary variable, and it need not be completely accurate. In fact, results in the literature have shown that no matter how poor the quality of the ranking, procedures based on ranked set sampling tend to be at least as efficient as procedures based on simple random sampling. However, efforts to quantify the gains in efficiency for ranked set sampling procedures have been hampered by a shortage of available models for imperfect rankings. In this paper, we introduce a new class of models for imperfect rankings, and we provide a rigorous proof that essentially any reasonable model for imperfect rankings is a limit of models in this class. We then describe a specific, easily applied method for selecting an appropriate imperfect rankings model from the class. 相似文献
115.
116.
117.
118.
119.
Gay affirmative practice has recently been introduced into the social work literature as a culturally sensitive model for
working with gay, lesbian, and bisexual (GLB) adults, however, this model has rarely been applied to practice with GLB youth.
In this article, the authors review the literature to present the main tenets of gay affirmative practice, outline the challenges
that GLB youth face, and delineate the environmental and individual strengths that can be enhanced to promote well-being.
The authors then apply the gay affirmative practice model to GLB youth, offering concrete information about the specific knowledge,
attitudes, and skills that social workers should acquire to better serve the unique, yet diverse, needs of GLB youth. 相似文献
120.
Annette Zimmer 《Gruppendynamik und Organisationsberatung》2003,34(4):331-345
Cultural and professional associations are the expression of the modern society with structured organisations. The 19th century was the marking epoch of the constitution of associations in Germany. The involvement of associations in the political live, specially the professional ones, is typical in Germany. While political sciences focus on the analyses of interest representation and mediation functions of organisations, sociology research covers the full range of social, psychological, political and economical functions of organisations. Management and especially human resource management topics are presently gaining a growing importance within the research community which focuses on the cultural and professional organisations. 相似文献