全文获取类型
收费全文 | 16049篇 |
免费 | 468篇 |
专业分类
管理学 | 2478篇 |
民族学 | 89篇 |
人才学 | 2篇 |
人口学 | 1552篇 |
丛书文集 | 80篇 |
教育普及 | 1篇 |
理论方法论 | 1551篇 |
现状及发展 | 1篇 |
综合类 | 203篇 |
社会学 | 7794篇 |
统计学 | 2766篇 |
出版年
2023年 | 116篇 |
2021年 | 89篇 |
2020年 | 257篇 |
2019年 | 370篇 |
2018年 | 400篇 |
2017年 | 552篇 |
2016年 | 429篇 |
2015年 | 317篇 |
2014年 | 386篇 |
2013年 | 2724篇 |
2012年 | 574篇 |
2011年 | 549篇 |
2010年 | 424篇 |
2009年 | 382篇 |
2008年 | 428篇 |
2007年 | 455篇 |
2006年 | 409篇 |
2005年 | 414篇 |
2004年 | 392篇 |
2003年 | 338篇 |
2002年 | 383篇 |
2001年 | 403篇 |
2000年 | 376篇 |
1999年 | 355篇 |
1998年 | 244篇 |
1997年 | 235篇 |
1996年 | 220篇 |
1995年 | 213篇 |
1994年 | 177篇 |
1993年 | 210篇 |
1992年 | 218篇 |
1991年 | 192篇 |
1990年 | 206篇 |
1989年 | 230篇 |
1988年 | 199篇 |
1987年 | 174篇 |
1986年 | 187篇 |
1985年 | 198篇 |
1984年 | 213篇 |
1983年 | 194篇 |
1982年 | 159篇 |
1981年 | 145篇 |
1980年 | 137篇 |
1979年 | 164篇 |
1978年 | 111篇 |
1977年 | 106篇 |
1976年 | 107篇 |
1975年 | 99篇 |
1974年 | 92篇 |
1973年 | 82篇 |
排序方式: 共有10000条查询结果,搜索用时 975 毫秒
51.
We discuss Bayesian analyses of traditional normal-mixture models for classification and discrimination. The development involves application of an iterative resampling approach to Monte Carlo inference, commonly called Gibbs sampling, and demonstrates routine application. We stress the benefits of exact analyses over traditional classification and discrimination techniques, including the ease with which such analyses may be performed in a quite general setting, with possibly several normal-mixture components having different covariance matrices, the computation of exact posterior classification probabilities for observed data and for future cases to be classified, and posterior distributions for these probabilities that allow for assessment of second-level uncertainties in classification. 相似文献
52.
John D. Emerson David C. Hoaglin Frederick Mosteller 《Statistical Methods and Applications》1993,2(3):269-290
Summary Meta-analyses of sets of clinical trials often combine risk differences from several 2×2 tables according to a random-effects
model. The DerSimonian-Laird random-effects procedure, widely used for estimating the populaton mean risk difference, weights
the risk difference from each primary study inversely proportional to an estimate of its variance (the sum of the between-study
variance and the conditional within-study variance). Because those weights are not independent of the risk differences, however,
the procedure sometimes exhibits bias and unnatural behavior. The present paper proposes a modified weighting scheme that
uses the unconditional within-study variance to avoid this source of bias. The modified procedure has variance closer to that
available from weighting by ideal weights when such weights are known. We studied the modified procedure in extensive simulation
experiments using situations whose parameters resemble those of actual studies in medical research. For comparison we also
included two unbiased procedures, the unweighted mean and a sample-size-weighted mean; their relative variability depends
on the extent of heterogeneity among the primary studies. An example illustrates the application of the procedures to actual
data and the differences among the results.
This research was supported by Grant HS 05936 from the Agency for Health Care Policy and Research to Harvard University. 相似文献
53.
54.
Craig C. Lundberg 《International Journal of Value-Based Management》1992,5(1):107-117
This paper focuses upon an as yet under-explored factor believed to underlie most managerial and organizational behavior variables—work ideology. Work ideologies are surveyed for several convenience samples of students and managers to show their ability to be studied and that patterned differences may be discovered. In addition, the historical origins and meanings of four major work ideologies are discussed. 相似文献
55.
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
56.
This paper studies a robust approach to the analysis of cell pedigree data, building on the work of Huggins & Marschner (1991) which discussed M-estimation for the so-called bifurcating autoregressive process. The study allows for incomplete observation of the pedigree, and incorporates the possibility of additive effects outliers, as discussed in the time series literature. Some properties of the proposed estimation procedure are studied, including a Monte Carlo investigation of robustness in the presence of contamination. 相似文献
57.
58.
59.
Jack C. Wall DSW 《Child and Adolescent Social Work Journal》1992,9(5):441-456
The purpose of this study was to identify relevant factors associated with the noncustodial father's frequency of contact with his child following divorce. The findings of the research revealed that a combination of demographic, personal characteristics, and psychosocial factors are related to the father's frequency of contact with the child. 相似文献
60.
The social worker as psychoanalyst 总被引:1,自引:0,他引:1
This paper examines the development of social workers as psychoanalysts to determine whether psychoanalysis is a legitimate function of social work. Historically, social work has found psychoanalytic theory helpful. However, it is generally understood that for the caseworker to competently practice psychoanalytic psychotherapy, advanced training is necessary. Although many social workers have availed themselves of this opportunity, the profession continues to believe that the practice of psychoanalysis is incompatible with social work. This is based upon an inaccurate conception of psychoanalysis. Since the social work psychoanalyst is concerned with the client's adaptation to the environment, his or her practice can easily be defined as clinical social work. 相似文献