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991.
This paper considers a likelihood ratio test for testing hypotheses defined by non-oblique closed convex cones, satisfying the so called iteration projection property, in a set of k normal means. We obtain the critical values of the test using the Chi-Bar-Squared distribution. The obtuse cones are introduced as a particular class of cones which are non-oblique with every one of their faces. Examples with the simple tree order cone and the total order cone are given to illustrate the results. 相似文献
992.
Over the last 40 years, the Sahel has seen a long-term downward trend in rainfall. The importance of ecological variables as factors affecting child survival in rural subsistence societies has already been emphasized, but little empirical evidence has been gathered to support this. This paper presents a comparative event history analysis aimed at understanding how rainfall variations may influence child mortality in two neighbouring countries, Burkina Faso and Mali. These countries are similar in terms of population dynamics, economy, livelihood, child mortality and rainfall conditions (i.e. strong south–north decreasing rainfall gradient). Individual data for both countries came from two detailed nationally representative retrospective surveys conducted in 2000. Rainfall data for the 1960–1998 time period were obtained from the Climatic Research Unit. This study shows that child survival in each country is related to specific patterns of rainfall variation across livelihood regions, highlighting the complex nature of environmental causality of child mortality. 相似文献
993.
Motion picture performance: A review and research agenda 总被引:1,自引:0,他引:1
Allègre L. Hadida 《国际管理评论杂志》2009,11(3):297-335
This paper provides a comprehensive literature review of empirical studies of motion picture performance published from 1977 to 2006 inclusive in the following five disciplines of the social sciences: strategy, organization theory, marketing, cultural economics and sociology. It introduces a novel framework which organizes the various dimensions and explanatory factors of movie performance into five distinct categories and underscores their relationships. The paper, which uses this model as a roadmap for discussions of film success, serves two complementary purposes. First, it clarifies the current state of the literature, stresses core contributions and exposes limitations in existing research by emphasizing hitherto neglected independent explanatory factors, dependent dimensions and correlations between them. Second, it introduces five conceptual, methodological and empirical suggestions for further cinema performance research aimed at addressing these limitations and, accordingly, at providing better accounts of motion picture performance in view of the fast-changing conditions of cinema production, marketing and consumption. 相似文献
994.
Data on population trends in Russia show that despite fluctuations, the long-term trend is a continued decline in the size of the Russian population. The government's pro-fertility policies may not be able to stem this trend, and the potential for in-migration of people of Russian descent is almost exhausted. 相似文献
995.
996.
We know that inequality varies by region and also begins early in life. Bivariate data suggest that 5–14-year-old children in the 1994 National Longitudinal Survey of Youth (NLSY) score differently in reading and mathematics achievement depending on their region, with children in the South and West scoring lower. We combine literatures on regional bases of inequality and family and school capital to generate hypotheses explaining these differences. Analyses of covariance provide supportive evidence. For both outcomes among boys, the variation is explained by additive models including family and child social and human capital, although selected aspects of school capital are also influential; these models also explain math achievement among girls. A model including both additive and interactive effects explains regional differences in reading achievement for girls. We interpret these findings in terms of their implications for studying inequality in child achievement as well as for emphasizing the importance of regional inequality, particularly beyond the South versus non-South distinction. 相似文献
997.
Tammy L. Henderson Maria Sirois Angela Chia-Chen Chen Christopher Airriess David A. Swanson David Banks 《Population research and policy review》2009,28(1):67-92
In 2005, the National Science Foundation funded a number of projects to study the impact of Hurricane Katrina. The current
article provides an overview of several research approaches used to conduct post-Katrina research. Each method had some advantages
and disadvantages. The post-disaster context meant that experience from traditional survey methods often did not apply. Comparisons
of advantages and disadvantages associated with each sampling method serve to inform future post-disaster research and illuminate
the limits of classical research methods. 相似文献
998.
PD Dr. Sascha L. Schmidt Prof. Dr. Benno Torgler Prof. Dr. Dr. h.c. mult. Bruno S. Frey 《Zeitschrift für Betriebswirtschaft》2009,79(3):303-334
Relative income differences are likely to lead to envy within a reference group. Envy in turn influences social behavior and individual performance. While positional concerns are apparent in daily life, empirical evidence is rare in the economic literature. This paper investigates the impact of the relative income position on individuals’ performance or productivity. As ?performance“ is difficult to measure we turn to soccer players whose performance has been well documented. The broad sample covers eight seasons of the German premier soccer league (Bundesliga) between 1995 and 2004, and includes 1040 players, a salary proxy and several performance variables. The results show that player performance is strongly affected by relative income position. A disadvantage in the relative income position reduces productivity. The larger the income differences within a team, the stronger are the effects of positional concern. Team composition also significantly affects behaviour. 相似文献
999.
When using data envelopment analysis (DEA) as a benchmarking technique for nursing homes, it is essential to include measures of the quality of care. We survey applications where quality has been incorporated into DEA models and consider the concerns that arise when the results show that quality measures have been effectively ignored. Three modeling techniques are identified that address these concerns. Each of these techniques requires some input from management as to the proper emphasis to be placed on the quality aspect of performance. We report the results of a case study in which we apply these techniques to a DEA model of nursing home performance. We examine in depth not only the resulting efficiency scores, but also the benchmark sets and the weights given to the input and output measures. We find that two of the techniques are effective in insuring that DEA results discriminate between high and low quality performance. 相似文献
1000.
Considering the integral relationship between public relations and democracy (Martinelli, 2011) coupled with the growing use of social media for democratic aims (Smith, 2011) the current study examines the effectiveness of Twitter as a public relations communications tool for congressional campaigns. Specifically, as a means of testing Twitter's effectiveness in informing and engaging voters, congressional candidate and political party Twitter use for all 435 U.S. House of Representatives races (N = 1284) are compared with 2010 election outcomes. Results indicate that candidates’ Twitter use significantly increased their odds of winning, controlling for incumbency and Party ID. Additionally, significant differences between incumbents’ and challengers’ Twitter use during the election cycle emerged, which has important implications for public relations practices aimed at achieving democratic outcomes. 相似文献