Formal volunteering as a protector of health in the context of social losses

This study aims to examine the effect of the death of a family member or friend on psychological well-being, specifically the moderating effects of first-time volunteering and social network. With the sample of 354 volunteers from the Experience Corps® (EC) programs, Analysis of covariance (ANCOVA) estimated the differences in psychological well-being. Among volunteers who had experienced the death of a family member or friend, new volunteers showed significant improvement in positive affect compared to experienced volunteers. EC members gained additional social contacts through volunteering. Formal volunteering has a salutatory effect on older adults' health after the loss of family members.     

Economic Crisis and its Consequences

Social Indicators Research - The financial crisis that began in late 1997, led to a catastrophic downturn of economic and social development in Korea. Rather than dealing with the macroeconomic and...     

AIDS education and prevention programs for intravenous drug users: the California experience

The state of California, pursuant to 1985 legislation, established the California AIDS Program (CAP) within the state Office of AIDS. As part of this program, the Office of AIDS contracts with public and private agencies to provide AIDS education to specific target groups throughout the state. Intravenous drug users (IVDUs) constitute one of the target populations singled out for special attention by the state. This article, based on a statewide evaluation, describes the AIDS education programs for IVDUs funded by the Office of AIDS. The types of educational interventions used are presented, both for IVDUs in treatment and those not in treatment. The unique problems in reaching this target population are also discussed. The article concludes that the state is making a good effort to reach IVDUs, but that further educational and evaluative efforts are needed. Specifically, the individual educational programs must move beyond the transmission and evaluation of cognitive knowledge about AIDS to an assessment of the attitudes that impede behavior change.     

Cluster analysis of massive datasets in astronomy

Clusters of galaxies are a useful proxy to trace the distribution of mass in the universe. By measuring the mass of clusters of galaxies on different scales, one can follow the evolution of the mass distribution (Martínez and Saar, Statistics of the Galaxy Distribution, 2002). It can be shown that finding galaxy clusters is equivalent to finding density contour clusters (Hartigan, Clustering Algorithms, 1975): connected components of the level set S _c ≡{f>c} where f is a probability density function. Cuevas et al. (Can. J. Stat. 28, 367–382, 2000; Comput. Stat. Data Anal. 36, 441–459, 2001) proposed a nonparametric method for density contour clusters, attempting to find density contour clusters by the minimal spanning tree. While their algorithm is conceptually simple, it requires intensive computations for large datasets. We propose a more efficient clustering method based on their algorithm with the Fast Fourier Transform (FFT). The method is applied to a study of galaxy clustering on large astronomical sky survey data.     

Bayesian variable selection with strong heredity constraints

In this paper, we propose a Bayesian variable selection method for linear regression models with high-order interactions. Our method automatically enforces the heredity constraint, that is, a higher order interaction term can exist in the model only if both of its parent terms are in the model. Based on the stochastic search variable selection George and McCulloch (1993), we propose a novel hierarchical prior that fully considers the heredity constraint and controls the degree of sparsity simultaneously. We develop a Markov chain Monte Carlo (MCMC) algorithm to explore the model space efficiently while accounting for the heredity constraint by modifying the shotgun stochastic search algorithm Hans et al. (2007). The performance of the new model is demonstrated through comparisons with other methods. Numerical studies on both real data analysis and simulations show that our new method tends to find relevant variable more effectively when higher order interaction terms are considered.     

Graphical methods for evaluating ridge regression estimator in mixture experiments

When the component proportions in mixture experiments are restricted by lower and upper bounds, multicollinearity appears all too frequently. Thus, we can suggest the use of ridge regression as a mean for stabilizing the coefficient estimates in the fitted model. We propose graphical methods for evaluating the effect of ridge regression estimator with respect to the predicted response value and the prediction variance.     

State Economic Strength and Some Methodological Issues on Its Assessment

At present, many international organizations and scholars, who are aimed to compare and assess country-specific economy or competitiveness, have set different standards and indicators and tried to assess the economic strength of individual country. But most of these standards and indicators are for the assessment of individual aspects and what is worse, they are not suitable for the real situation of the countries concerned. This paper deals with methodological issues on the assessment of state economic strength. To this end, authors investigate the preceding studies on the assessment of economy of a given country, conceptualize the state economic strength, set a new system of indicators for assessing it and on this basis, produce a methodology for the synthetic assessment of state economic strength. The findings are that state economic strength must be defined in a view of economic capability which any country can exhibit by itself even under uncertain external environment, the indicators for assessing it include a variety of indicators in line with its essence, and assessment methodology must be synthetic one based on considering the weights of indicators. These findings may help, on the one hand, in assessing the economy of a given country and taking an economic and technical measures for its strengthening for policymakers, and on the other hand, in comparing and assessing the country-specific economy for organizations or scholars in a new perspective.

     

Examining cultural and gender similarities and differences in college students’ value of communication skills in romantic relationships

This study assessed and compared the communication skills that native Chinese and native American college students value in the context of romantic relationships. A total of 319 Chinese and 262 American college students responded to questionnaires that assessed the values they placed on six different communication skills. The results showed that the American students valued four of six communication skills more than the Chinese students (i.e. conversational, informative, listening, and narrative skills). The men and women in both cultural groups valued affective communication skills more than instrumental communication skills. In both cultural groups, women placed greater value on affective communication skills than men. The findings also showed a significant mediating effect of gender orientation (masculinity and femininity) on the value placed on communication skills and a significant effect of self-construal, which mediated between nationality and the value assigned to communication skills.