全文获取类型
收费全文 | 8282篇 |
免费 | 112篇 |
专业分类
管理学 | 1226篇 |
民族学 | 28篇 |
人口学 | 774篇 |
丛书文集 | 29篇 |
理论方法论 | 630篇 |
综合类 | 106篇 |
社会学 | 3587篇 |
统计学 | 2014篇 |
出版年
2021年 | 42篇 |
2020年 | 119篇 |
2019年 | 161篇 |
2018年 | 225篇 |
2017年 | 280篇 |
2016年 | 196篇 |
2015年 | 137篇 |
2014年 | 194篇 |
2013年 | 1362篇 |
2012年 | 265篇 |
2011年 | 252篇 |
2010年 | 187篇 |
2009年 | 180篇 |
2008年 | 153篇 |
2007年 | 194篇 |
2006年 | 169篇 |
2005年 | 170篇 |
2004年 | 153篇 |
2003年 | 150篇 |
2002年 | 160篇 |
2001年 | 202篇 |
2000年 | 197篇 |
1999年 | 178篇 |
1998年 | 135篇 |
1997年 | 133篇 |
1996年 | 137篇 |
1995年 | 113篇 |
1994年 | 107篇 |
1993年 | 100篇 |
1992年 | 145篇 |
1991年 | 123篇 |
1990年 | 122篇 |
1989年 | 116篇 |
1988年 | 103篇 |
1987年 | 95篇 |
1986年 | 97篇 |
1985年 | 112篇 |
1984年 | 115篇 |
1983年 | 127篇 |
1982年 | 105篇 |
1981年 | 91篇 |
1980年 | 87篇 |
1979年 | 96篇 |
1978年 | 94篇 |
1977年 | 82篇 |
1976年 | 70篇 |
1975年 | 67篇 |
1974年 | 60篇 |
1973年 | 59篇 |
1971年 | 50篇 |
排序方式: 共有8394条查询结果,搜索用时 15 毫秒
11.
12.
In our zeal to deal with alcohol and drug abuse, we may have a distorted picture of what the majority of college students actually think about alcohol and drug use. Students in this study done at a public university located in the Deep South report being generally intolerant of substance abuse. 相似文献
13.
14.
Anthony G. Pakes Ravindra Khattree 《Australian & New Zealand Journal of Statistics》1992,34(2):307-322
A positive random variable X with a finite mean has an induced length-biased law represented by Y, and Y is stochastically larger than X. An independent uniform random contraction of Y, UY, has the same law as X if and only if the latter is exponential. This property is extended to non-uniform contractions and a more general notion of length-biasing. The distributional equality of X and W leads to a functional equation for the moment function of X, which has either Infinitely many solutions or none. When U is constant, X can have a log-normal law, but it can also have laws with the same moment sequence as this log-nod law. The case where U has a certain beta, or generalized beta, law give t3 characterizations of generalized gamma laws, or to products of independent copies of them. This occurs even when these laws are not determined by their moment sequences. 相似文献
15.
Suzanne T. Ortega David R. Johnson Peter G. Beeson Betty J. Craft 《Rural sociology》1994,59(4):598-619
Abstract This paper examines rural/urban differences and trends in mental health during the farm crisis of the 1980s in a large panel sample from a midwestern state. A community research perspective, which attributes differences to life styles, culture, and community context, is contrasted with an economic stress perspective, which focuses on individual differences in economic circumstances as determinants of rural-urban differences in mental health. Survey samples from 1981, 1986, and 1989 are used to examine differences among seven categories of community type. Multiple regression analysis of the trend and panel data provide support for both the individual economic distress and community context models. 相似文献
16.
The problem of estimating the value of an x variable for a given proportion of an observed value of the y variable is consdered for a non-linear model. Asymptotic confidence limits are obtained and an application of the method is illustrated witreal data. 相似文献
17.
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
18.
Stuart G. Baker Barnett S. Kramer 《Journal of the Royal Statistical Society. Series C, Applied statistics》2005,54(5):941-954
Summary. When evaluating potential interventions for cancer prevention, it is necessary to compare benefits and harms. With new study designs, new statistical approaches may be needed to facilitate this comparison. A case in point arose in a proposed genetic substudy of a randomized trial of tamoxifen versus placebo in asymptomatic women who were at high risk for breast cancer. Although the randomized trial showed that tamoxifen substantially reduced the risk of breast cancer, the harms from tamoxifen were serious and some were life threaten-ing. In hopes of finding a subset of women with inherited risk genes who derive greater bene-fits from tamoxifen, we proposed a nested case–control study to test some trial subjects for various genes and new statistical methods to extrapolate benefits and harms to the general population. An important design question is whether or not the study should target common low penetrance genes. Our calculations show that useful results are only likely with rare high penetrance genes. 相似文献
19.
Using a simple theoretical model and giving an empirical example it is investigated if it matters whether we use (monthly) averages or end-of-period (month) data in performing Granger-causality tests. It is shown that no major problems are to be expected if the two series are temporally aggregated in the same way, but non-trivial problems can occur if the two series have different kinds of temporal aggregation. 相似文献
20.
Peter G. W. Schouten 《Journal of marital and family therapy》1994,20(1):53-60
The article examines some issues raised in Gavin and Wamboldt's (1992) recent study on the Family-of-Origin Scale (FOS) (Hovestadt, Anderson, Piercy, Cochran, & Fine, 1985). The discussion centers on unresolved concerns regarding the validity and utility of the FOS and on unsubstantiated and potentially misleading claims made in the Gavin and Wamboldt article. A case is made for conceptual and methodological precision in the study of family phenomena. 相似文献