Testing equality of several exponential distributions

Roy's union-intersection principle is used to develop a test procedure to test the equality of scale parameters of several exponential distributions. Upper five and one percent values of the test statistic for two and three exponential distributions are tabulated and an illustrative simulated example is qiven.     

Analysis of designs with two-way elimination of heterogeneity

We consider designs for which the treatment association matrices for the row design and for the column design commute. For these designs it is shown that the usual procedures of combined estimation yield unbiased estimates of treatment differences. For an important special class of designs a procedure of combined estimation is proposed which assures improvement over the estimates obtained from the interaction analysis.     

Binary designs are not always the best

We give an example of a nonbinary block design which is better than any binary design with respect to the E-optimality criterion. This shows that the class of binary designs is not essentially complete, at least with respect to E-optimality.     

An overview of present and future emigration dynamics in South Asia

The author presents preliminary findings on selected aspects of the dynamics which govern emigration from and within the South Asian region comprised of Bangladesh, India, Pakistan, and Sri Lanka. The paper attempts to identify some of the major reasons for observed migration flows and how the future may be envisaged especially in view of government programs, policies, and priorities. Contract labor migration is given special attention since it has become the predominant type of migration in the region. Sections consider a possible conceptual framework; measuring emigration pressure or potential; data and data problems; the volume of emigration since 1970; South Asian migrant workers; macro-level determinants of emigration; community, family, and individual factors; and sending country policies. The consequences of emigration are discussed in terms of the impacts upon the labor force and non-economic consequences. Observations for the future conclude the paper. Analysis of the dynamics of emigration from South Asia indicate an urgent need to improve data on various forms of emigration, that relevant officials in countries of origin have a longstanding concern about the exploitation of workers in sending as well as receiving countries, and the need to better understand the linkages between various factors relevant to the emigration process. An understanding of such linkages would allow for more realistic policies and planning for future emigration.     

Arab labour migration: a review of trends and issues

"The objectives set for this paper are to: provide an analysis of volume and trends in labour migration within the Arab region; discuss the major characteristics of the migrants, including demographic features, types of economic activity, wage levels and duration of stay in host countries; [and] outline and discuss the major issues in labour migration both from the sending and receiving countries. The time period covered by the study is from the mid 1970s to the present." (SUMMARY IN FRE AND SPA)     

Are peer educators really peers?

OBJECTIVE, PARTICIPANTS, AND METHODS: To determine whether peer educators are considered peers by their audiences, the authors compared 28 peer educators and 28 college students on their personal qualities using self-report surveys. RESULTS: Students who wanted to become peer educators reported higher self-esteem, greater leadership skills, and fewer risky health behaviors than did demographically similar college students. However, peer educators appeared similar to their colleagues in terms of personal values and personality temperament. CONCLUSIONS: Although peer educators are natural leaders with strong self-esteem and more healthy behaviors, they appear to be quite similar to their audiences in regard to values and temperaments, making them successful role models and arguably true peers.     

当代大众文化对青年价值取向的影响

文化建构人的价值意识。改革开放以来,大众文化日益成为青年成长的主要文化情境。青年价值取向,是青年心理与周围文化世界的有机契合,在青年对大众文化的热情追随和狂热消费中,世俗与低俗共生、回归与沉沦同奏、感性与泛感性交织,呈现出前所未有的新格局。加强大众文化建设和创新青年价值观教育是提升当代青年价值取向的现实选择。     

Tracking the defining moments of crisis process and practice

Crisis holds the potential for profound change in organizations and industries. The past 50 years of crisis management highlight key shifts in crisis practice, creating opportunities for multiple theories and research tracks. Defining crises such as Tylenol, Exxon Valdez, and September 11 terrorist attacks have influenced or challenged the principles of best practice of crisis communication in public relations. This study traces the development of crisis process and practice by identifying shifts in crisis research and models and mapping these against key management theories and practices. The findings define three crisis domains: crisis planning, building and testing predictive models, and mapping and measuring external environmental influences. These crisis domains mirror but lag the evolution of management theory, suggesting challenges for researchers to reshape the research agenda to close the gap and lead the next stage of development in the field of crisis communication for effective organizational outcomes.     

Toward a generation free of tuberculosis: TB disease and infection in individuals of college age in the United States

Objectives: To assess the magnitude of active TB disease and latent TB infection (LTBI) in young adults of college age. Participants: Individuals who were aged 18–24 years in 2011 were used as a proxy for college students. Methods: Active TB cases reported to the 2011 US National TB Surveillance System (NTSS) were included. LTBI prevalence was calculated from the 2011–2012 National Health and Nutrition Examination Survey. The 2011 American Community Survey was used to calculate population denominators. Analyses were stratified by nativity. Results: Active TB disease incidence among persons aged 18–24 years was 2.82/100,000, 18.8/100,000 among foreign-born individuals and 0.9/100,000 among US-born individuals. In 2011, 878 TB cases were reported; 629 (71.6%) were foreign-born. LTBI prevalence among persons of 18–24 years was 2.5%: 8.7% and 1.3% among foreign-born and US-born, respectively. Conclusion: Active screening and treatment programs for foreign-born young adults could identify TB cases earlier and provide an opportunity for prevention efforts.