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   167篇
  免费   12篇
管理学   38篇
民族学   1篇
人才学   1篇
人口学   4篇
丛书文集   1篇
理论方法论   24篇
社会学   88篇
统计学   22篇
  2023年   3篇
  2020年   3篇
  2019年   1篇
  2018年   4篇
  2017年   3篇
  2016年   5篇
  2015年   6篇
  2014年   7篇
  2013年   42篇
  2012年   3篇
  2011年   5篇
  2010年   5篇
  2009年   4篇
  2008年   6篇
  2007年   4篇
  2006年   4篇
  2005年   3篇
  2004年   3篇
  2003年   2篇
  2002年   6篇
  2001年   4篇
  2000年   3篇
  1999年   3篇
  1998年   3篇
  1997年   4篇
  1996年   3篇
  1995年   6篇
  1994年   4篇
  1993年   1篇
  1991年   4篇
  1989年   6篇
  1988年   3篇
  1987年   3篇
  1986年   1篇
  1985年   2篇
  1981年   1篇
  1979年   3篇
  1976年   1篇
  1975年   2篇
  1971年   1篇
  1970年   1篇
  1967年   1篇
排序方式: 共有179条查询结果,搜索用时 343 毫秒
91.
We present a simple model of the effects of hate crime legislation. We show that even if the direct harm to victims of hate crime is the same as for other crimes, because of other differences in the effects it may still be optimal to exert a different level of law‐enforcement effort to deter or prevent hate crime. These differences also have previously unrecognized effects on the optimal level of effort by potential hate crime victims to avoid being victimized, thus affecting the efficiency of government policies that encourage or discourage such effort. In some cases, the optimal level of government effort may be lower for hate crimes than for other crimes. Our analysis suggests a role for policy tools that influence individual avoidance effort directly. We discuss the implications of our results for similar types of crime, including terrorism. (JEL K42, K14, D02)  相似文献   
92.
93.
The propensity for charitable bequest giving is much lower than for current charitable giving. Some nonexperimental evidence suggests that this difference may be due to the relatively greater importance of family benefit considerations in charitable bequest giving than in current charitable giving. To test this concept experimentally, the effects of a family–charity conflict reduction message (that is, a reminder of family connections to a cause and an opportunity to make a tribute gift) are measured for both current and bequest giving. For those with family connections to a cause, the message generated increased interest in charitable bequest giving but not in current charitable giving. This result provides experimental support for previous suggestions regarding the special role of family considerations in charitable bequest giving. Managers may profitably consider the use of tribute messages to encourage bequest, but not necessarily current, charitable giving. Such messages were effective at increasing bequest intentions for all organization types and demographic groups tested, especially where the tribute was in honor of an ascendant such as a mother, grandmother, grandfather, or uncle.  相似文献   
94.
Objectives. We take a step forward in examining the electoral effects of redistricting by: (1) demonstrating that voters with a new incumbent because of redistricting are less likely to recognize their representative, and (2) voters are less likely to vote for their representative if they fail to recognize him or her. Methods. Our data come from a survey of white respondents who resided in the redrawn Eighth District of Georgia for the 2006 U.S. House elections. We use probit regressions to first measure the effect of redistricting on incumbent recognition. Then, we assess the likelihood of voting for the incumbent depending on whether a respondent was redrawn or has the same incumbent after redistricting, and whether or not the respondent could recognize his or her representative. Results. Our analyses make it clear that redrawn voters were much less likely to recognize their incumbent and it is the inability to recognize one's incumbent, irrespective of whether the representative has changed due to redistricting, which accounts for a reduced likelihood of voting for the incumbent. Conclusions. Other scholars have examined the relationship between redistricting and incumbent recognition. Likewise, many have evaluated the effects of redistricting on vote choice. This article, however, is the first to merge these two relationships. We find that redrawn constituents are less likely to know who their representative is, and it is indeed a lack of familiarity that reduces an incumbent's vote share. Thus, we have shown empirically that the absence of a personal vote, which is exacerbated by redistricting, proves electorally harmful to the incumbent.  相似文献   
95.
Multivariate analysis techniques are applied to the two-period repeated measures crossover design. The approach considered in this paper has the advantage over the univariate analysis approach proposed recently by Wallenstein and Fisher (1977) that the former does not require any specific structure on the variance-covariance matrix of the repeated measures factor. (It should be noted that sums and differences of observations over periods are used for all tests. Therefore, there are two matrices under consideration, one for sums and one for differences.) Tests of significance are derived using the Wilks? criterion, and the procedure is illustrated with a numerical example from the area of clinical trials.  相似文献   
96.
Under stratified random sampling, we develop a kth-order bootstrap bias-corrected estimator of the number of classes θ which exist in a study region. This research extends Smith and van Belle’s (1984) first-order bootstrap bias-corrected estimator under simple random sampling. Our estimator has applicability for many settings including: estimating the number of animals when there are stratified capture periods, estimating the number of species based on stratified random sampling of subunits (say, quadrats) from the region, and estimating the number of errors/defects in a product based on observations from two or more types of inspectors. When the differences between the strata are large, utilizing stratified random sampling and our estimator often results in superior performance versus the use of simple random sampling and its bootstrap or jackknife [Burnham and Overton (1978)] estimator. The superior performance is often associated with more observed classes, and we provide insights into optimal designation of the strata and optimal allocation of sample sectors to strata.  相似文献   
97.
Applying a hockey stick parametric dose-response model to data on late or retarded development in Iraqi children exposed in utero to methylmercury, with mercury (Hg) exposure characterized by the peak Hg concentration in mothers'hair during pregnancy, Cox et al. calculated the "best statistical estimate" of the threshold for health effects as 10 ppm Hg in hair with a 95% range of uncertainty of between 0 and 13.6 ppm.(1)A new application of the hockey stick model to the Iraqi data shows, however, that the statistical upper limit of the threshold based on the hockey stick model could be as high as 255 ppm. Furthermore, the maximum likelihood estimate of the threshold using a different parametric model is virtually zero. These and other analyses demonstrate that threshold estimates based on parametric models exhibit high statistical variability and model dependency, and are highly sensitive to the precise definition of an abnormal response. Consequently, they are not a reliable basis for setting a reference dose (RfD) for methylmercury. Benchmark analyses and statistical analyses useful for deriving NOAELs are also presented. We believe these latter analyses—particularly the benchmark analyses—generally form a sounder basis for determining RfDs than the type of hockey stick analysis presented by Cox et al. However, the acute nature of the exposures, as well as other limitations in the Iraqi data suggest that other data may be more appropriate for determining acceptable human exposures to methylmercury.  相似文献   
98.
The importance of considering a continuum of Emotionality (E) separately from Rationality (R) or Activity (A) is emphasized. A model showing equally all three aspects is presented that allows a clearer classification of family therapy theorists than has been possible heretofore. Diagnostic, therapeutic, and research implications are hinted at, but will be part of future work.  相似文献   
99.
In this paper we take a view of advertising and certain other nonprice competition as public goods. This leads to a new fundamental justification of the zero price distribution of advertising, coupled with a mark-up of the advertised good as a disguised form of price discrimination which approximates that required for efficient pricing of a public good. Further, we present a numerical counterexample wherein the commonly-observed zero price distribution of advertising is shown to lead to higher consumer and seller welfare than its separate sales at cost.  相似文献   
100.
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