Simultaneous variable selection and outlier identification in linear regression using the mean-shift outlier model

We provide a method for simultaneous variable selection and outlier identification using the mean-shift outlier model. The procedure consists of two steps: the first step is to identify potential outliers, and the second step is to perform all possible subset regressions for the mean-shift outlier model containing the potential outliers identified in step 1. This procedure is helpful for model selection while simultaneously considering outlier identification, and can be used to identify multiple outliers. In addition, we can evaluate the impact on the regression model of simultaneous omission of variables and interesting observations. In an example, we provide detailed output from the R system, and compare the results with those using posterior model probabilities as proposed by Hoeting et al. [Comput. Stat. Data Anal. 22 (1996), pp. 252-270] for simultaneous variable selection and outlier identification.     

Influence of advertising on acceptance of press releases

To analyze the influence of advertising on the acceptance of press releases, this study examined two national and two local newspapers. The results of this study show that journalists and editors partially consider advertisers while selecting press releases. Specifically, local newspapers give more consideration to advertisers than national newspapers. However, when journalists and editors select press releases, they consider not only advertisers but the newsworthiness of the press releases.     

Error variance estimation via least squares for small sample nonparametric regression

In this paper we explore statistical properties of some difference-based approaches to estimate an error variance for small sample based on nonparametric regression which satisfies Lipschitz condition. Our study is motivated by Tong and Wang (2005), who estimated error variance using a least squares approach. They considered the error variance as the intercept in a simple linear regression which was obtained from the expectation of their lag-k Rice estimator. Their variance estimators are highly dependent on the setting of a regressor and weight of their simple linear regression. Although this regressor and weight can be varied based on the characteristic of an unknown nonparametric mean function, Tong and Wang (2005) have used a fixed regressor and weight in a large sample and gave no indication of how to determine the regressor and the weight. In this paper, we propose a new approach via local quadratic approximation to determine this regressor and weight. Using our proposed regressor and weight, we estimate the error variance as the intercept of simple linear regression using both ordinary least squares and weighted least squares. Our approach applies to both small and large samples, while most existing difference-based methods are appropriate solely for large samples. We compare the performance of our approach with other existing approaches using extensive simulation study. The advantage of our approach is demonstrated using a real data set.     

Inference for comparing a multinomial distribution with a known standard

We propose a new type of stochastic ordering which imposes a monotone tendency in differences between one multinomial probability and a known standard one. An estimation procedure is proposed for the constrained maximum likelihood estimate, and then the asymptotic null distribution is derived for the likelihood ratio test statistic for testing equality of two multinomial distributions against the new stochastic ordering. An alternative test is also discussed based on Neyman modified minimum chi-square estimator. These tests are illustrated with a set of heart disease data.     

From Role Conflict to Job Burnout: A Mediation Model Moderated by Mindfulness

This study examined the moderated mediating effect of mindfulness as an emotional resource on the relationship between role conflict and burnout (i.e., exhaustion, cynicism, and professional inefficacy) via negative affect. Participants were 481 adult employees in South Korea who provided self-report data 2 times with a 2-week interval. The results indicated that mindfulness moderated the relationship between role conflict and negative affect such that the effect of role conflict on negative affect was reduced when mindfulness was high. Furthermore, Time 1 role conflict had conditional indirect effects on 3 facets of burnout measured at Time 2 through Time 1 negative affect depending on the levels of Time 1 mindfulness. The findings suggest that mindfulness may prevent the development of negative affect from role conflict, ultimately reducing the impact of role conflict on burnout. Practitioners should introduce workplace mindfulness programs to help employees cope with burnout more effectively.     

Asian and Pacific Region Authorship Characteristics in Leading Library and Information Science Journals

Authorship characteristics from the Asian and Pacific region in the top twenty journals in library and information science are studied. Data was collected searching the Institute for Scientific Information (ISI) Web of Science databases. Major findings of this study are: there are a total of 1,317 articles for the period 1967 to 2005; the most productive countries are, in rank order, Australia, China, South Korea, Taiwan, Singapore, Japan, New Zealand, Malaysia, Thailand and Philippines; and 77.6 percent of authors in the top twenty library and information science journals contributed a single article. Among the library science journals about 50 percent were written by multiple authors, while 73.1 percent of articles in the information science journals were written collaboratively. The most productive individual authors in the region are reported. The strongest collaboration within the region took place between Australia and China; China and Singapore; Australia and New Zealand.     

Influence of Acculturative Stress of Married Migrant Women on Marriage Satisfaction: The Mediating Effect of Problem‐Solving Ability and Information Support

This paper aims to examine the mediating effect of problem‐solving ability and information support on the relationship between acculturative stress and marriage satisfaction of married migrant women. To this end, the research model was established on the basis of the stress‐coping theories and resource model, and existing relevant research, and the mediating effect was verified through a structural equation. The subjects were married migrant women living in Busan and Gyeongsangnam‐do. The data from 307 respondents to questionnaires was used for analysis. In accordance with the analysis, the goodness‐of‐fit of the measurement model and structure model was significant. Moreover, problem‐solving ability had a mediating effect on the relationship between acculturative stress and marriage satisfaction. However, information support had no mediated effect on the relationship between acculturative stress and marriage satisfaction. This paper suggests practical implications of improving marriage satisfaction of migrant women on the basis of the analysis results.     

Factors associated with the preventive healthcare service use among older adults in Korea: Focusing on age variation

The importance of preventive health examinations for older adults has been well emphasized due to an increase in chronic diseases associated with age. In this study, we estimated the preventive health examination participation rate and its associated factors among the elderly with specific focuses on the moderating effects between age and socioeconomic status. We used data drawn from the first to sixth waves (4164 people) of the Korean Longitudinal Study of Aging for the elderly aged 65 and over. A generalized linear model was used to address research questions. The results showed that the participation rate decreased as older adults age. The interaction between age and education was also significant, indicating that older adults with higher education were more likely to use a preventive health examination compared to those with lower education. There were no significant interaction effects between income and age. Based on the findings, implications for theory and practice were discussed with specific focuses on age‐specific approaches in preventive healthcare services for older adults.     

Nonpharmacological Pain Management by Ethnically Diverse Older Adults With Chronic Pain: Barriers and Facilitators

As key players in multidisciplinary health care systems, geriatric social workers must understand the dynamics of pain management among older adults with chronic pain. This study identified perceived barriers to, and facilitators for, utilizing nonpharmacological pain management through face-to-face interviews with 44 ethnically diverse community-dwelling older adults. Constant comparative analysis identified barriers not recognized in prior studies: (a) embarrassment/self-consciousness, (b) unavailability of certain treatments, and (c) lack of faith in effectiveness of nonpharmacological treatments. Most frequently reported facilitators were (a) social support, (b) positive attitude, and (c) available resources. Social workers can provide counseling to motivate older adults to exercise to manage chronic pain and refer them to exercise programs tailored for older adults. To resolve the most frequently reported barrier—transportation—social workers can link older adults with transportation services offered by senior centers or other nonprofit agencies.