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   77篇
  免费   4篇
管理学   15篇
人口学   12篇
理论方法论   3篇
社会学   21篇
统计学   30篇
  2023年   1篇
  2022年   4篇
  2021年   5篇
  2020年   2篇
  2019年   6篇
  2018年   7篇
  2016年   5篇
  2015年   4篇
  2014年   7篇
  2013年   8篇
  2012年   4篇
  2011年   6篇
  2010年   3篇
  2009年   1篇
  2008年   1篇
  2007年   2篇
  2005年   1篇
  2004年   3篇
  2002年   1篇
  2001年   2篇
  2000年   1篇
  1999年   1篇
  1994年   1篇
  1992年   1篇
  1991年   1篇
  1989年   2篇
  1987年   1篇
排序方式: 共有81条查询结果,搜索用时 31 毫秒
1.
Summary Letg(x) andf(x) be continuous density function on (a, b) and let {ϕj} be a complete orthonormal sequence of functions onL 2(g), which is the set of squared integrable functions weighted byg on (a, b). Suppose that over (a, b). Given a grouped sample of sizen fromf(x), the paper investigates the asymptotic properties of the restricted maximum likelihood estimator of density, obtained by setting all but the firstm of the ϑj’s equal to0. Practical suggestions are given for performing estimation via the use of Fourier and Legendre polynomial series. Research partially supported by: CNR grant, n. 93. 00837. CT10.  相似文献   
2.
3.
Portmanteau tests are typically used to test serial independence even if, by construction, they are generally powerful only in presence of pairwise dependence between lagged variables. In this article, we present a simple statistic defining a new serial independence test, which is able to detect more general forms of dependence. In particular, differently from the Portmanteau tests, the resulting test is powerful also under a dependent process characterized by pairwise independence. A diagram, based on p-values from the proposed test, is introduced to investigate serial dependence. Finally, the effectiveness of the proposal is evaluated in a simulation study and with an application on financial data. Both show that the new test, used in synergy with the existing ones, helps in the identification of the true data-generating process. Supplementary materials for this article are available online.  相似文献   
4.
Economic literature suggests that economic factors and the availability of amenities act as determinants of migration choices together with socio‐demographic factors. Migration has also been found to be the consequence of political instability. This article argues that specific political events, i.e., democratic elections, may be linked to migration flows. By using European data over the 1999‐2012 time period, our system GMM estimations reveal that there is an emigration political cycle across European democracies and across the young democracies of Central and Eastern European countries. We observe that regular elections tend to diminish emigration ratios, whereas endogenous elections have the opposite effect. These results suggest special challenges for governments and oppositions, which are also discussed.  相似文献   
5.
Abstract. This paper shows that the explicit consideration of the “expected inflation effect” makes it more likely that increases in wage and price flexibility reduce employment variability. This result, obtained in a monopolistic competition model with synchronized contracts, casts doubts on some existing consensus in the literature pointing towards the opposite view. Wage and price flexibility, although ceteris paribus desirable, is however shown to be an inferior substitute for optimally designed demand management.  相似文献   
6.
ABSTRACT: Protectionist policies are often supported by an ‘unholy‘ alliance of industrial lobbies and labour unions, under the assumption that trade barriers will favour higher profits, wage rates and employment. Even when one takes the narrow view of self-interest in a single producing sector, however, things are not necessarily what they seem and protectionism may have more profound consequences than those expected by lobbyists and negotiators. The paper reviews the methodologies developed to measure the extent and the consequences of industrial protectionism in order to derive operational guidelines to evaluate alternative trade policies.  相似文献   
7.
Packaging and labeling play a crucial role awhile protecting medicaments and transmitting a range of crucial information to the users. Taking into account the scarcity of specific studies in this area, it was considered great the need for a comprehensive survey about customers' satisfaction when handling these containers.  相似文献   
8.
This study investigated the moderating role of hardiness in the relationship between psychological well‐being (PWB) and career indecision in 131 never‐employed Italian emerging adults. Cluster analytic methods produced high and low hardiness profiles. A structural equation modeling analysis underscored the importance of hardiness for moderating the negative association between PWB and career indecision. Specifically, findings revealed that being hardy is a crucial relevant personal resource in the presence of lower levels of PWB. The authors discuss the importance of analyzing simultaneously the role of PWB and hardiness in promoting engagement in the career decision‐making process and provide implications for setting up appropriate career counseling interventions with emerging adults. Suggestions for future research are presented, such as the use of longitudinal designs and qualitative methods.  相似文献   
9.
Elderly patients with cardiovascular events are characterized by high drug consumptions. Whether high drug consumptions are related to physical activity is not known. In order to examine whether physical activity is related to drug consumption in the elderly, patients older than 65 years (n?=?250) with a recent cardiovascular event were studied. Physical activity was analyzed according to the Physical Activity Scale for the Elderly (PASE) score and related to drug consumption. PASE score was 72.4?±?45.0 and drug consumption was 8.3?±?2.2. Elderly patients with greater comorbidity took more drugs (8.7?±?2.1) and are less active (PASE?=?64.4?±?50.6) than patients with Cumulative Illness Rating Scale severity score higher than 1.8 than those with a score lower than 1.8 (76.3?±?41.4, p?<?0.05, and 8.0?±?2.0, p?=?0.006, respectively). Multivariate analysis correlation confirmed that PASE score is negatively associated with drug consumption (β?=??0.149, p?=?0.031), independently of several variables including comorbidity. Thus, physical activity is inversely related to drug consumption in elderly patients with cardiovascular events. This inverse relationship may be attributable to the high degree of comorbidity observed in elderly patients in whom poor level of physical activity and high drug consumption are predominant.  相似文献   
10.
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