全文获取类型
收费全文 | 99720篇 |
免费 | 2018篇 |
国内免费 | 5篇 |
专业分类
管理学 | 13418篇 |
民族学 | 577篇 |
人才学 | 25篇 |
人口学 | 8171篇 |
丛书文集 | 544篇 |
教育普及 | 1篇 |
理论方法论 | 9931篇 |
综合类 | 2294篇 |
社会学 | 47235篇 |
统计学 | 19547篇 |
出版年
2023年 | 531篇 |
2021年 | 600篇 |
2020年 | 1575篇 |
2019年 | 2279篇 |
2018年 | 2336篇 |
2017年 | 3415篇 |
2016年 | 2600篇 |
2015年 | 2098篇 |
2014年 | 2724篇 |
2013年 | 19193篇 |
2012年 | 2832篇 |
2011年 | 2670篇 |
2010年 | 2227篇 |
2009年 | 2315篇 |
2008年 | 2315篇 |
2007年 | 2176篇 |
2006年 | 2328篇 |
2005年 | 2487篇 |
2004年 | 2346篇 |
2003年 | 2062篇 |
2002年 | 2169篇 |
2001年 | 2280篇 |
2000年 | 2065篇 |
1999年 | 1895篇 |
1998年 | 1625篇 |
1997年 | 1479篇 |
1996年 | 1443篇 |
1995年 | 1467篇 |
1994年 | 1412篇 |
1993年 | 1388篇 |
1992年 | 1459篇 |
1991年 | 1394篇 |
1990年 | 1372篇 |
1989年 | 1213篇 |
1988年 | 1273篇 |
1987年 | 1141篇 |
1986年 | 1065篇 |
1985年 | 1224篇 |
1984年 | 1271篇 |
1983年 | 1148篇 |
1982年 | 1043篇 |
1981年 | 928篇 |
1980年 | 883篇 |
1979年 | 975篇 |
1978年 | 864篇 |
1977年 | 760篇 |
1976年 | 712篇 |
1975年 | 689篇 |
1974年 | 579篇 |
1973年 | 489篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
221.
A. F. Bissell 《Journal of applied statistics》1992,19(2):193-210
The fitting of a straight line that must pass through (0, 0) is a frequently encountered application of linear regression. Many computer packages provide a least-squares option sometimes identified as NO INT, or even NOINT, or as ‘suppressing the intercept’. Often these procedures are invalid or do not correspond to the most suitable model. This paper questions the least-squares-line approach and suggests some alternatives. Two measures are proposed for comparing the fit of alternative models. 相似文献
222.
223.
Anthony G. Pakes Ravindra Khattree 《Australian & New Zealand Journal of Statistics》1992,34(2):307-322
A positive random variable X with a finite mean has an induced length-biased law represented by Y, and Y is stochastically larger than X. An independent uniform random contraction of Y, UY, has the same law as X if and only if the latter is exponential. This property is extended to non-uniform contractions and a more general notion of length-biasing. The distributional equality of X and W leads to a functional equation for the moment function of X, which has either Infinitely many solutions or none. When U is constant, X can have a log-normal law, but it can also have laws with the same moment sequence as this log-nod law. The case where U has a certain beta, or generalized beta, law give t3 characterizations of generalized gamma laws, or to products of independent copies of them. This occurs even when these laws are not determined by their moment sequences. 相似文献
224.
Michael H. LeRoy 《Journal of Labor Research》1992,13(4):371-379
One hundred and sixty-four elite union leaders in the United States completed a survey to assess the condition of the American
labor movement and the factors affecting it. The respondents included high-level international union and state federation
officers, central labor presidents, and 58 shop stewards. This study compares the responses of these labor officials and finds
that they have similar, negative assessments of the condition of the American labor movement. The study also finds that these
leaders agree that the most important factors affecting the labor movement are collective bargaining rights, union leadership,
union member solidarity, and the NLRB. 相似文献
225.
226.
Dale R. Meers D.S.W. 《Child and Adolescent Social Work Journal》1992,9(2):99-116
The more things change, the worse they get.Presented April 18, 1991, Duke University, at the Department of Psychiatry's Grand Rounds, this paper condenses, integrates and updates the author's earlier publication. Acknowledgement and thanks for funding and professional sponsorship of the four research studies this paper draws from are selectively due to the Eugene and Agnes E. Meyer Foundation, the Edgar Stern Family Fund, The National Institute for Mental Health, the Baltimore-Washington Institute for Psychoanalysis and the Department of Psychiatry, Children's Hospital National Medical Center. 相似文献
227.
228.
ANDREW R. DICK 《Economic inquiry》1992,30(2):332-354
Firms facing research costs and demand uncertainty may engage in second-sourcing, in which potential suppliers agree to pool production facilities. I show how sellers and buyers both can benefit from the practice. Second-sourcing allows firms to meet a wider range of possible rates of demand and often to supply a given rate of demand at a lower total cost than under non-cooperation. Buyers benefit through a reduced probability of stock-outs and frequently a lower purchase price. Semiconductor industry data are found to be consistent with the paper's predictions. 相似文献
229.
A. R. Tricker 《Journal of applied statistics》1992,19(4):465-471
This paper is concerned with how standard estimation procedures perform in terms of eficiency for non-normal rounded data. Previous research has shown that the loss in eficiency due to rounding normal data is small. However, evidence from the non-normal distribution considered in this paper suggests, if rounding is coarse or the distribution is very skewed the loss in efficiency due to rounding can be considerable. 相似文献
230.