全文获取类型
收费全文 | 37777篇 |
免费 | 1484篇 |
国内免费 | 24篇 |
专业分类
39285篇 |
出版年
2020年 | 418篇 |
2019年 | 430篇 |
2018年 | 654篇 |
2017年 | 695篇 |
2016年 | 695篇 |
2015年 | 491篇 |
2014年 | 588篇 |
2013年 | 2867篇 |
2012年 | 1134篇 |
2011年 | 1257篇 |
2010年 | 759篇 |
2009年 | 705篇 |
2008年 | 993篇 |
2007年 | 962篇 |
2006年 | 864篇 |
2005年 | 759篇 |
2004年 | 752篇 |
2003年 | 699篇 |
2002年 | 751篇 |
2001年 | 1340篇 |
2000年 | 1345篇 |
1999年 | 951篇 |
1998年 | 423篇 |
1997年 | 375篇 |
1992年 | 776篇 |
1991年 | 699篇 |
1990年 | 739篇 |
1989年 | 713篇 |
1988年 | 685篇 |
1987年 | 655篇 |
1986年 | 678篇 |
1985年 | 689篇 |
1984年 | 542篇 |
1983年 | 487篇 |
1982年 | 351篇 |
1981年 | 331篇 |
1979年 | 551篇 |
1978年 | 420篇 |
1977年 | 368篇 |
1976年 | 337篇 |
1975年 | 510篇 |
1974年 | 593篇 |
1973年 | 535篇 |
1972年 | 505篇 |
1971年 | 433篇 |
1970年 | 396篇 |
1969年 | 503篇 |
1968年 | 539篇 |
1967年 | 469篇 |
1966年 | 494篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
881.
882.
883.
884.
885.
886.
A general approach to confirmatory maximum likelihood factor analysis 总被引:17,自引:0,他引:17
K. G. Jöreskog 《Psychometrika》1969,34(2):183-202
We describe a general procedure by which any number of parameters of the factor analytic model can be held fixed at any values and the remaining free parameters estimated by the maximum likelihood method. The generality of the approach makes it possible to deal with all kinds of solutions: orthogonal, oblique and various mixtures of these. By choosing the fixed parameters appropriately, factors can be defined to have desired properties and make subsequent rotation unnecessary. The goodness of fit of the maximum likelihood solution under the hypothesis represented by the fixed parameters is tested by a large samplex
2 test based on the likelihood ratio technique. A by-product of the procedure is an estimate of the variance-covariance matrix of the estimated parameters. From this, approximate confidence intervals for the parameters can be obtained. Several examples illustrating the usefulness of the procedure are given.This work was supported by a grant (NSF-GB 1985) from the National Science Foundation to Educational Testing Service. 相似文献
887.
888.
Donald G. Dickason 《Journal of counseling and development : JCD》1969,47(10):1008-1014
An awareness and commitment rating was assessed for a freshman engineering class to determine whether this type of non-intellective measure could help improve the predictability of academic success. The total sample was broken into subsamples based on the interview condition of the student: staff interview; alumni interview; or no interview. The existence of a factor defined as awareness/commitment was supported. For the total sample a significant correlation was found, but at a very low level. For the subsample interviewed by staff, a correlation of .31 was determined. This relationship suggests the possibility of real usefulness for the admissions interview in identifying the factor of awareness and commitment, and thereby improving the prediction of academic success in a professional curriculum such as engineering. 相似文献
889.
This study asked the question: What are the role expectancies of treatment personnel in the treatment community and are they consistent across patients' emotional condition? An 83-item inventory was developed and administered under three different sets of instructions, each characterizing a different patient condition. Treatment staff and administrators were asked to rate items on the basis of the level of expectancy they held for their team vocational rehabilitation counselor. The analyses suggest that treatment staff and counselors do not agree on role expectations and that patient condition is a significant mediating variable. 相似文献
890.
Mukul K. Dey 《Psychological research》1969,33(1):79-84
Summary Retroactive inhibition in free-recall learning was measured under six degrees of meaningful similarity: zero, low, low-medium, medium, medium-high, and high. For each degree of similarity, an experimental and a control group of 20 Ss each learned a list of 20 unrelated adjectives through three cycles of alternate study and unpaced free recall. Immediately thereafter, the experimental group learned a second list of 20 adjectives, while the control group rested. Finally, a single recall trial was administered to both groups to measure first-list retention. The results have revealed a relationship which is at variance with the relationships observed in both serial and paired-associate learning but conforms to the curvilinear function earlier formulated by Skaggs and Robinson. Fresh arguments are offered in defence of the Skaggs-Robinson hypothesis. 相似文献