Missing plot technique in linear models

This paper extends the missing plot substitution technique to the case where the missing observations-cause some previously estimable functions to become non-estimable. It is shown that with appropriate modifications, the usual methods of analysis remain valid. We also obtain necessary and sufficient conditions under which the sum of squares due to a hypothesis can be calculated without “re-estimating” the missing observations     

Athletes’ Perceptions of National Collegiate Athletic Association–Mandated Sickle Cell Trait Screening: Insight for Academic Institutions and College Health Professionals

Abstract

Objective: The study objective was to explore athletes’ perspectives of National Collegiate Athletic Association (NCAA)–mandated sickle cell trait (SCT)–screening policy by examining race- and gender-related differences in athletes’ perceptions regarding risk of having SCT and concern about loss of playing time. Participants: Participants were 259 athletes at a southeastern United States campus during April–August of 2010. Methods: Athletes completed a 21-question survey. Results: The majority of athletes (81.7%) perceived that they would have a high level of concern if found to carry the SCT. African Americans were 9.07 times more likely than Caucasians to perceive risk of having the SCT. The majority of athletes disagreed (38.4%) or did not know (50.8%) if they would lose playing time related to carrying the SCT. Conclusion: Campus health professionals must be aware of athletes’ perspectives on NCAA's SCT screening so that athletes are not unnecessarily subjected to stress or harm.     

Increased Focus on the Mouth Among Infants in the First Year of Life: A Longitudinal Eye‐Tracking Study

This study examines face‐scanning behaviors of infants at 6, 9, and 12 months as they watched videos of a woman describing an object in front of her. The videos were created to vary information in the mouth (speaking vs. smiling) and the eyes (gazing into the camera vs. cueing the infant with head turn or gaze direction to an object being described). Infants tended to divide their attention between the eyes and the mouth, looking less at the eyes with age and more at the mouth than the eyes at 9 and 12 months. Attention to the mouth was greater on speaking trials than on smiling trials at all three ages, and this difference increased between 6 and 9 months. Despite consistent results within subjects, there was considerable variation between subjects. This raises the question of whether a developmental “norm” of face scanning in infancy ought to be pursued. Rather, these data add to emerging evidence suggesting that individual differences in face scanning might reliably predict aspects of later development.     

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。