全文获取类型
收费全文 | 32468篇 |
免费 | 572篇 |
国内免费 | 2篇 |
专业分类
管理学 | 4181篇 |
民族学 | 191篇 |
人才学 | 11篇 |
人口学 | 3024篇 |
丛书文集 | 201篇 |
教育普及 | 2篇 |
理论方法论 | 3223篇 |
现状及发展 | 1篇 |
综合类 | 488篇 |
社会学 | 16247篇 |
统计学 | 5473篇 |
出版年
2023年 | 143篇 |
2021年 | 153篇 |
2020年 | 478篇 |
2019年 | 751篇 |
2018年 | 748篇 |
2017年 | 1065篇 |
2016年 | 787篇 |
2015年 | 616篇 |
2014年 | 754篇 |
2013年 | 5400篇 |
2012年 | 1067篇 |
2011年 | 1000篇 |
2010年 | 786篇 |
2009年 | 768篇 |
2008年 | 847篇 |
2007年 | 873篇 |
2006年 | 800篇 |
2005年 | 803篇 |
2004年 | 825篇 |
2003年 | 685篇 |
2002年 | 733篇 |
2001年 | 820篇 |
2000年 | 678篇 |
1999年 | 640篇 |
1998年 | 551篇 |
1997年 | 496篇 |
1996年 | 488篇 |
1995年 | 474篇 |
1994年 | 461篇 |
1993年 | 466篇 |
1992年 | 480篇 |
1991年 | 486篇 |
1990年 | 435篇 |
1989年 | 432篇 |
1988年 | 420篇 |
1987年 | 393篇 |
1986年 | 364篇 |
1985年 | 422篇 |
1984年 | 422篇 |
1983年 | 397篇 |
1982年 | 337篇 |
1981年 | 283篇 |
1980年 | 312篇 |
1979年 | 312篇 |
1978年 | 263篇 |
1977年 | 253篇 |
1976年 | 244篇 |
1975年 | 242篇 |
1974年 | 212篇 |
1973年 | 163篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
A. F. Bissell 《Journal of applied statistics》1992,19(3):351-366
In a previous paper (Bissell, 1989) some suggestions were offered for interpreting mean squares in saturated fractional designs where no independent estimate of experimental error is available. One of the methods leads to a simple numerical test of homogeneity which provides an objective accompaniment to half-Normal plotting of effects (Daniel, 1959) in 2n designs or exponential plotting of mean squares (Bissell, 1989) in 3n designs. A table of percentage points for a convenient test statistic is provided in this paper. 相似文献
72.
73.
The robustness of Mauchly's sphericity test criterion when sampling from a mixture of two multivariate normal distributions is studied. The distribution of the sphericity test criterion when the sample covariance matrix has a non-central Wishart density of rank one is derived in terms of Meijer's G-functions; its distribution under the mixture model is then deduced. The robustness is studied by computing actual significance levels of the test under the mixture model using the critical values under the usual normal model. 相似文献
74.
Major policy changes like the 1986 Tax Reform Act (TRA) in the United States provide natural experiments to study attitudinal and behavior responses to law. Surprisingly, public evaluations of the TRA became increasingly negative after passage, while general support for the tax system became more positive in response to the changes. To explain this puzzle, we propose a dynamic model of taxpayer attitudes that is consistent with the observed loose linkage between logically-connected concepts. We briefly review the political context, objectives and impacts of the 1986 Tax Reform Act, and present several studies testing the impact of self-interest, prior beliefs, and social discussion on changes in attitudes and behavior.Results suggest that the complexity of taxes and difficulty in knowing objective impacts weakens the role of self-interest in attitudinal changes, thereby strengthening the role of prior beliefs and discussion. Evaluations of tax laws are most responsive to more politically-oriented influences. 相似文献
75.
76.
The present studies examined children's and adults' preferences for gender- or age-based categorization using similarity and inductive inference tasks. Four-year-olds, 6-year-olds, and adults looked at pictures of people and decided which of two was more like a target (similarity condition) or which shared a novel age- or gender-related property with the target (inference condition). Age or gender-based matches were possible. The results are consistent with previous findings that gender-based classification decreases with age. However, they also demonstrate that children use gender more for judging similarity than for making inferences about novel properties. Distinct patterns emerge from the two tasks: 6-year-olds and adults in both conditions categorize more by age than gender; 4-year-olds categorize by gender more than age in the similarity task, but by age more in the induction task. Only adults differentiated by property in the inference condition. These findings suggest that the salience of gender categories cannot entirely be attributed to their inductive potential. Gender has a salience beyond what would be predicted by its power for directing novel generalizations. 相似文献
77.
We propose some estimators of noncentrality parameters which improve upon usual unbiased estimators under quadratic loss. The distributions we consider are the noncentral chi-square and the noncentral F. However, we give more general results for the family of elliptically contoured distributions and propose a robust dominating estimator. 相似文献
78.
Deviance in intimate relationships may lie as much within the micro system of such relationships as it does within the personalities of the actors involved. Using a Parsonsian framework, it is argued that the strain of systemically disequilibrated relationships can produce deviant personality adaptations which, in turn, intensify conflict and deviance in those relationships. It is also proposed that a reciprocal quality exists to such maladaptations, with each member of the dyad contributing to the amplification of a stable system of deviant behavior patterns within the relationship. Because the patterns of maladaptive dyads spill over into parent-child relationships, they have implications for understanding intergenerational transmission of deviance between intimates. 相似文献
79.
80.
The most popular methodology used by the US International Trade Commission (USITC) commissioners to determine whether dumped and/or subsidized imports injure competing domestic industries has been rejected by reviewing bodies because it does not distinguish injury caused by unfairly traded imports from other demand or supply changes. We estimate injury to the domestic industry due to changes in unfairly traded import price and to other causes for 44 USITC dumping and/or subsidy investigations. Change in unfairly traded import price was typically not the most important cause of injury to the domestic industry. (JEL F13 ) 相似文献