首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   92011篇
  免费   1961篇
  国内免费   3篇
管理学   12356篇
民族学   556篇
人才学   25篇
人口学   7143篇
丛书文集   526篇
教育普及   2篇
理论方法论   9419篇
现状及发展   1篇
综合类   2177篇
社会学   42881篇
统计学   18889篇
  2023年   505篇
  2021年   565篇
  2020年   1504篇
  2019年   2200篇
  2018年   2111篇
  2017年   3167篇
  2016年   2379篇
  2015年   2031篇
  2014年   2627篇
  2013年   18827篇
  2012年   2466篇
  2011年   2240篇
  2010年   2005篇
  2009年   2215篇
  2008年   2110篇
  2007年   1911篇
  2006年   2124篇
  2005年   2318篇
  2004年   2199篇
  2003年   1917篇
  2002年   2012篇
  2001年   2032篇
  2000年   1802篇
  1999年   1701篇
  1998年   1509篇
  1997年   1360篇
  1996年   1312篇
  1995年   1336篇
  1994年   1320篇
  1993年   1291篇
  1992年   1304篇
  1991年   1231篇
  1990年   1201篇
  1989年   1038篇
  1988年   1125篇
  1987年   1005篇
  1986年   912篇
  1985年   1079篇
  1984年   1135篇
  1983年   1017篇
  1982年   943篇
  1981年   862篇
  1980年   820篇
  1979年   867篇
  1978年   775篇
  1977年   712篇
  1976年   657篇
  1975年   638篇
  1974年   517篇
  1973年   440篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
231.
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   
232.
233.
234.
This paper examines the demand for money in Bolivia during the 1980s, a decade of extreme instability with annual inflation rates reaching over 20,000 percent, and a subsequent stabilization, with annual rates falling to less than 25 percent and remaining so for more than five years.
Our empirical analysis makes use of error-correction approaches, time-varying-parameter estimation with Kalman filtering, and GARCH models of expected inflation and inflation variance. We find that expected inflation and inflation uncertainty both matter for money demand. Time-varying estimates show that the reaction to monetary disequilibria was significantly faster during hyperinflation.  相似文献   
235.
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   
236.
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   
237.
238.
All husbands and wives share in the spoils of marriage. Sharing makes each partner a residual claimant and encourages spouses to provide marital inputs. However, because each spouse is only a partial residual claimant, each may be inclined to provide a "suboptimal" level of marital inputs. The choice of spouse influences the level of distortion, and under some circumstances the efficient mating is between individuals of equal value  相似文献   
239.
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   
240.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号