全文获取类型
收费全文 | 5534篇 |
免费 | 278篇 |
国内免费 | 4篇 |
出版年
2023年 | 60篇 |
2022年 | 95篇 |
2021年 | 110篇 |
2020年 | 144篇 |
2019年 | 143篇 |
2018年 | 274篇 |
2017年 | 260篇 |
2016年 | 239篇 |
2015年 | 149篇 |
2014年 | 173篇 |
2013年 | 726篇 |
2012年 | 412篇 |
2011年 | 409篇 |
2010年 | 255篇 |
2009年 | 175篇 |
2008年 | 324篇 |
2007年 | 265篇 |
2006年 | 234篇 |
2005年 | 229篇 |
2004年 | 137篇 |
2003年 | 136篇 |
2002年 | 129篇 |
2001年 | 63篇 |
2000年 | 79篇 |
1999年 | 48篇 |
1998年 | 28篇 |
1997年 | 21篇 |
1996年 | 23篇 |
1995年 | 20篇 |
1994年 | 13篇 |
1993年 | 18篇 |
1992年 | 31篇 |
1991年 | 23篇 |
1990年 | 25篇 |
1989年 | 28篇 |
1988年 | 26篇 |
1987年 | 19篇 |
1985年 | 12篇 |
1984年 | 20篇 |
1983年 | 14篇 |
1979年 | 15篇 |
1978年 | 11篇 |
1976年 | 14篇 |
1974年 | 12篇 |
1973年 | 11篇 |
1971年 | 11篇 |
1970年 | 11篇 |
1969年 | 11篇 |
1968年 | 13篇 |
1965年 | 11篇 |
排序方式: 共有5816条查询结果,搜索用时 31 毫秒
21.
A new method is proposed for estimating factor means and factor covariances in a group of individuals selected on their observed scores. The selection variable is, for example, the total score on an admissions test. Given a factor model for the test items based on the group of test takers, we may be interested in the factor structure for those in the top quartile. The differences in factor means and covariances between this selected group and the full group gives useful information both on successful test performance and on test validity. The new method draws on the classic Pearson-Lawley selection formulas. It avoids the fallacy of factor analysis on the selected group, which would lead to incorrect estimates. The new method is applied to a simple factor structure model for the GMAT test. Although the majority of the GMAT items test verbal skills, it is found that a quantitative factor shows the greatest change in moving from average to top quartile test takers. 相似文献
22.
23.
A general latent variable model is given which includes the specification of a missing data mechanism. This framework allows for an elucidating discussion of existing general multivariate theory bearing on maximum likelihood estimation with missing data. Here, missing completely at random is not a prerequisite for unbiased estimation in large samples, as when using the traditional listwise or pairwise present data approaches. The theory is connected with old and new results in the area of selection and factorial invariance. It is pointed out that in many applications, maximum likelihood estimation with missing data may be carried out by existing structural equation modeling software, such as LISREL and LISCOMP. Several sets of artifical data are generated within the general model framework. The proposed estimator is compared to the two traditional ones and found superior.The research of the first author was supported by grant No. SES-8312583 from the National Science Foundation and by a Spencer Foundation grant. We wish to thank Chuen-Rong Chan for drawing the path diagram. 相似文献
24.
25.
Miguel A. García-Pérez 《Behavior research methods》1987,19(1):42-46
In this paper, we present a BASIC program for Apple II series computers that allows the user to obtain perspective drawings of two-dimensional functions of known analytical expression. Also, we outline a procedure for obtaining perspective representations of two-dimensional arrays of data using the same program. The program should run on any computer with graphics mode with only slight modifications in the graphics commands. 相似文献
26.
C. Gosselin 《Personality and individual differences》1984,5(3):365-369
Personality and attitude measurements were carried out on 204 adult males suffering from hair loss. Three groups were tested: those in the first group had had a hair weave fitted and were retaining the weave as a viable solution to their hair problem; the second had worn the weave for a trial period but had decided against its continued use; the third had had no form of treatment and seemed little concerned about their hair loss. Results showed that all three groups possessed N and P scores which were significantly higher than those shown by a normative group of males in the same age range, but that the weave-retaining group scored significantly lower on E than the normative group: other personality differences were non-significant. The group who had rejected the hair-weave treatment as a viable solution to their hair-loss problem was significantly more neurotic and possessed a significantly lower self-esteem than the group that retained the weave: this latter group had scores on these and all other variables tested which were very similar to those of the group that had had no treatment. 相似文献
27.
A questionnaire was developed to measure beliefs about and experiences with violence in the family. Two groups of persons in two different states who had attended conferences on battered women participated in this research. Of the 177 subjects (84% women, 16% men), none of the men had been battered, yet over one-third of the women had been; more older women reported having been adult battering victims than did younger women; the women had less formal education than the men; the women in the lower educational groups were more likely to have been battered and to report fear of becoming victims; and the social service workers reported little fear of battering. 相似文献
28.
David W. Trimble Ph.D. Jodie Kliman Ph.D. Albert Villapiano E.d.D. William Beckett M.S.W. 《Contemporary Family Therapy》1984,6(2):102-113
The authors conducted two full-scale network assemblies for the family network of a suicidal adolescent. Findings from the clinical follow-up and telephone interviews with 21 of 65 participants revealed benefits for the index family and the network members who participated in the meetings. A ripple effect in which the participants' own personal networks improved was also demonstrated. Benefits included resolution of a suicidal crisis, better understanding of depression and family stress, more adaptive responses to depression and suicidal risk, and improved personal relationships. No casualties from this intervention were discovered. This report is intended to stimulate future, more systematic outcome studies. 相似文献
29.
A general structural equation model with dichotomous,ordered categorical,and continuous latent variable indicators 总被引:21,自引:0,他引:21
Bengt Muthén 《Psychometrika》1984,49(1):115-132
A structural equation model is proposed with a generalized measurement part, allowing for dichotomous and ordered categorical variables (indicators) in addition to continuous ones. A computationally feasible three-stage estimator is proposed for any combination of observed variable types. This approach provides large-sample chi-square tests of fit and standard errors of estimates for situations not previously covered. Two multiple-indicator modeling examples are given. One is a simultaneous analysis of two groups with a structural equation model underlying skewed Likert variables. The second is a longitudinal model with a structural model for multivariate probit regressions.This research was supported by Grant No. 81-IJ-CX-0015 from the National Institute of Justice, by Grant No. DA 01070 from the U.S. Public Health Service, and by Grant No. SES-8312583 from the National Science Foundation. I thank Julie Honig for drawing the figures. Requests for reprints should be sent to Bengt Muthén, Graduate School of Education, University of California, Los Angeles, California 90024. 相似文献
30.
One of the most serious psychosocial problems worldwide is substance abuse because of its repercussions not only on the physical and psychological health of the abuser but also on their relational functioning. Among the well-established therapeutic approaches for the treatment of substance abuse is family therapy, which, in addition to influencing personal variables, promotes changes in family dynamics. The main objective of this study is to review the scientific literature published from 2010 to the present on the efficacy and effectiveness shown by family-based treatment approaches for substance use problems both in adolescent and adult samples. In addition, the effect on secondary variables such as family functioning and behavioral problems is evaluated. The empirical evidence accumulated in the last decade and reviewed in the present study indicates that the incorporation of family members in the treatment of substance abuse produces benefits by diminishing consumption and improving family functioning. Limitations of this study and of the research reviewed are discussed and directions for future research are provided. 相似文献