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   87848篇
  免费   2922篇
  国内免费   3篇
管理学   12135篇
民族学   525篇
人才学   25篇
人口学   6629篇
丛书文集   505篇
理论方法论   9274篇
综合类   2078篇
社会学   40909篇
统计学   18693篇
  2023年   504篇
  2021年   560篇
  2020年   1497篇
  2019年   2194篇
  2018年   2016篇
  2017年   3096篇
  2016年   2320篇
  2015年   2034篇
  2014年   2612篇
  2013年   18818篇
  2012年   2269篇
  2011年   2031篇
  2010年   1901篇
  2009年   2139篇
  2008年   1958篇
  2007年   1757篇
  2006年   2025篇
  2005年   2214篇
  2004年   2103篇
  2003年   1830篇
  2002年   1930篇
  2001年   1900篇
  2000年   1684篇
  1999年   1612篇
  1998年   1462篇
  1997年   1319篇
  1996年   1269篇
  1995年   1305篇
  1994年   1274篇
  1993年   1249篇
  1992年   1224篇
  1991年   1148篇
  1990年   1128篇
  1989年   975篇
  1988年   1073篇
  1987年   949篇
  1986年   843篇
  1985年   1013篇
  1984年   1091篇
  1983年   976篇
  1982年   904篇
  1981年   837篇
  1980年   791篇
  1979年   845篇
  1978年   748篇
  1977年   672篇
  1976年   642篇
  1975年   625篇
  1974年   498篇
  1973年   424篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
291.
292.
This paper discusses some uses in econometrics of empirical process theory for dependent rendom variables. Examples considered include non-standard parametric hypotheses tests and semiparametric estimation. The application of bracketing functional limit results is discussed in some detail  相似文献   
293.
I test the hypothesis that the growth of autonomy was the factor responsible for the decline of marital fertility in eight Eastern European countries. By growth of autonomy I mean increased control over one's political, personal, religious, economic and reproductive life. This increased control was manifested in revolutions, democratic political reforms, nationalist movements and declining marital fertility. The political reforms were the result of the growth of autonomy but they also accelerated the dissemination of these new ideas among the populace contributing to further growth of autonomy. My hypothesis is generally supported by the historical data.  相似文献   
294.
Ohne Zusammenfassung German translations by Monika Lütke-Daldrup.  相似文献   
295.
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   
296.
297.
298.
Understanding the role of sexualization in a depressed patient gives us the opportunity to re-examine the place of sexual activity in psychopathology. The self psychological concept of the mirror transference is used to explain the therapist's activity in the case illustration.  相似文献   
299.
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   
300.
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   
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