全文获取类型
收费全文 | 341篇 |
免费 | 6篇 |
专业分类
管理学 | 63篇 |
人口学 | 25篇 |
理论方法论 | 28篇 |
综合类 | 1篇 |
社会学 | 194篇 |
统计学 | 36篇 |
出版年
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 3篇 |
2014年 | 6篇 |
2013年 | 85篇 |
2012年 | 19篇 |
2011年 | 6篇 |
2010年 | 2篇 |
2009年 | 6篇 |
2008年 | 3篇 |
2007年 | 9篇 |
2006年 | 6篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 5篇 |
2002年 | 5篇 |
2001年 | 6篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 5篇 |
1995年 | 6篇 |
1994年 | 9篇 |
1993年 | 8篇 |
1992年 | 6篇 |
1991年 | 8篇 |
1990年 | 9篇 |
1989年 | 2篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有347条查询结果,搜索用时 0 毫秒
321.
322.
The two-stage clonal expansion model is a popular model for carcinogenesis data. One common form of this model is based on the approximate hazard function. In certain situations, this formulation is not appropriate, and the exact hazard should be applied. However, the difficulty of implementing the model based on the exact hazard has deterred many from using it. This paper presents a program implementing the exact hazard model for piecewise constant dosing using SAS, a package that is readily available to most that are interested in this type of analysis. Also, an analysis of the ED01 data is presented using this program, and comparisons are made to an earlier analysis based on the approximate hazard. By allowing for an independent background tumor mechanism, an excellent fit to the bladder tumor incidence data was obtained. 相似文献
323.
This paper presents an investigation of the behavior of the levels of significance of the two-sample t and its related tests and the Mann-Whitney test when the samples are randomly drawn from mixtures of two normal populations (compound normals) and when the sample sizes are small (combined sample sizes ? 15). The use of the compound normal allows for investigation when the underlying populations are unequal, nonnormal, heterogeneous in variances, unimodal or bimodal, possessing smaller than normal kurtosis or containing contamination. The exact distribution of the t and its related tests are given. However, they are not readily amenable to calculations. Most of the numerical results presented were obtained by simulations 相似文献
324.
325.
326.
327.
328.
Justin D. Martin Ralph J. Martins Shageaa Naqvi 《Information, Communication & Society》2018,21(1):129-146
Informed by research on the uses and gratifications of the Internet for political activity, this study examines predictors of online political efficacy among Internet users in five Arab countries (N?=?4029): Saudi Arabia, Tunisia, Lebanon, Qatar, and the U.A.E. As predicted, variables presumed to be associated with political dissidence in Arab countries – unemployment, distrust of mainstream media, young age, and feeling country is on the wrong track – were not positively associated with online political efficacy. Counter to what was hypothesized, however, Internet reliance and social media use were not strongly or consistently associated with online political efficacy in the five countries. Rather, the strongest predictors of efficacy were a belief in news media credibility, print media use (newspapers, magazines, and books), belief in the reliability of online information, and tolerance of free speech online. Findings align with some prior research on predictors of online political efficacy, but not with common presumptions of the role the Internet plays among Arab publics. 相似文献
329.
Ralph Anderson 《Journal of Social Distress and the Homeless》2013,22(4):369-380
Successful adaptation to street life requires that risk of violence, an often present aspect of this lifestyle, be reduced to as Iowa level as possible. This means knowing the infonnal rules which permit avoiding the pitfalls of street life. It is argued in this paper that safety and security are a function of interactions occurring within a specific place, with pal1icular associates, and involving safe and unsafe behavior. Carelessness with respect to any of these factors can result in victimization. These issues are discussed using SUlVey and ethnographic data collected in Chattanooga. 相似文献
330.