Organizational Support in the Workplace: The Case of Korean Hospital Employees

This paper tests three hypotheses on who getsmore support from his or her work organization: (1) Thevalidation hypothesis predicts that employees withgreater social support from their co-workers and supervisors receive more organizationalsupport, because their support validates or legitimizesorganizational support; (2) the positive affectivityhypothesis predicts that employees high on positiveaffect receive more organizational support, becausethey are more likable; and (3) the moderation hypothesispredicts that positive affect and social support do notgenerate organizational support independently, but each acts on the other to affectorganizational support. An assessment of the hypothesesover a sample of 1882 hospital employees in Koreaprovided strong support for the validation hypothesisand partial support for the moderation hypothesis. Contraryto the positive affectivity hypothesis, employees' gooddisposition in itself works against the bringing forthof relevant organizational support, net of support from their supervisors and co-workers.Additional findings related to the unique features ofthe current hospital employees in Korea are alsoreported. Finally, we discuss cross-cultural research implications of the study in moredetail.     

Job Strain, Workplace Discrimination, and Hypertension Among Older Workers: The Health and Retirement Study

Job strain has been associated with hypertension among younger workers; however, whether this relationship persists among older workers, particularly older racial/ethnic minorities, is unresolved. This study evaluated whether job strain and workplace discrimination are associated with hypertension and poor blood pressure control among older workers and whether these relationships vary by gender and race/ethnicity. Data were drawn from the Health and Retirement Study, and analysis was restricted to employed participants with complete information on job strain and blood pressure (N = 3,794). In adjusted models, high job strain was associated with lower likelihood of hypertension (odds ratio (OR): 0.75, 95% confidence interval (CI): 0.63, 0.89) relative to low job strain. Stratified analyses indicated this association was only significant among white (OR: 0.71, 95% CI: 0.58, 0.86) and male (OR: 0.61, 95% CI: 0.47, 0.79) workers. High job strain was not significantly associated with hypertension among African American (OR: 1.14, 95% CI: 0.63, 2.07) or Hispanic (OR: 0.56, 95% CI: 0.29, 1.09) workers. Workplace discrimination was not associated with hypertension among any group. Neither job strain nor discrimination was associated with poor blood pressure control. These findings suggest that persistence in work characterized by high job strain in later life may signal resilience to the influence of work-related stressors on health. Future research efforts should examine the factors that contribute to gender and racial differences in these relationships.     

Losing ground: The persistent declining economic fortunes of children

The primary purpose of this study is to investigate trends in the income status of children, as compared to that of adults and elderly people, from 1991 through 2005. Using the March 1992, 1999, and 2006 Current Population Surveys (CPS), this study examines income distributions of children relative to adults and elderly people at three stages: pre-transfer income, pre-transfer income plus social insurance benefits, and pre-transfer income plus social insurance benefits plus welfare payments. While children as well as adults and elderly people lost economic ground at the post-transfer income stage from 1991 to 2005, the losses experienced by children surpassed those of adults and elderly people. This occurred despite the fact that income growth among children was greater than that of adults and elderly people at the pre-transfer stage – a demonstration of increases in employment income of their parents which coincided with the welfare reforms of 1996. This study also found that declines in the distributive effect of both social insurance benefits and welfare payments were greater for minority children. Policy implications are discussed.     

Do American mothers use self-employment as a flexible work alternative?

Review of Economics of the Household - This paper provides evidence that self-employment is a quantitatively important work alternative that American mothers use to gain workplace flexibility....     

The Situational Theory of Publics in a Different Cultural Setting: Consumer Publics in Singapore

In an ever-globalizing world, it behooves one to ask whether, and if so to what extent, the theoretical constructs developed primarily in Western democracies are applicable elsewhere. This study used the Situational theory of publics to assess the communication behaviors of a sample of Singaporeans vis-à-vis the level of customer service in the retail sector. The study surveyed 242 retail customers and conducted 3 focus groups of retail consumers. Results revealed that the situational theory was quite useful in identifying the communication behaviors of consumer publics in Singapore. A majority of the respondents perceived high problem recognition but also displayed constrained behavior in responding to the problem. Only a few respondents exhibited activist behavior as described in the theory. Cultural factors such as deference to authority and collectivism played a significant role in the constrained behaviors of the respondents. We contend that the referent criterion, abandoned for over 2 decades, helps include culture as an independent variable in the theory.     

Robust multivariate mixture regression models with incomplete data

Multivariate mixture regression models can be used to investigate the relationships between two or more response variables and a set of predictor variables by taking into consideration unobserved population heterogeneity. It is common to take multivariate normal distributions as mixing components, but this mixing model is sensitive to heavy-tailed errors and outliers. Although normal mixture models can approximate any distribution in principle, the number of components needed to account for heavy-tailed distributions can be very large. Mixture regression models based on the multivariate t distributions can be considered as a robust alternative approach. Missing data are inevitable in many situations and parameter estimates could be biased if the missing values are not handled properly. In this paper, we propose a multivariate t mixture regression model with missing information to model heterogeneity in regression function in the presence of outliers and missing values. Along with the robust parameter estimation, our proposed method can be used for (i) visualization of the partial correlation between response variables across latent classes and heterogeneous regressions, and (ii) outlier detection and robust clustering even under the presence of missing values. We also propose a multivariate t mixture regression model using MM-estimation with missing information that is robust to high-leverage outliers. The proposed methodologies are illustrated through simulation studies and real data analysis.     

Stochastic approximation Monte Carlo EM for change-point analysis

In the expectation–maximization (EM) algorithm for maximum likelihood estimation from incomplete data, Markov chain Monte Carlo (MCMC) methods have been used in change-point inference for a long time when the expectation step is intractable. However, the conventional MCMC algorithms tend to get trapped in local mode in simulating from the posterior distribution of change points. To overcome this problem, in this paper we propose a stochastic approximation Monte Carlo version of EM (SAMCEM), which is a combination of adaptive Markov chain Monte Carlo and EM utilizing a maximum likelihood method. SAMCEM is compared with the stochastic approximation version of EM and reversible jump Markov chain Monte Carlo version of EM on simulated and real datasets. The numerical results indicate that SAMCEM can outperform among the three methods by producing much more accurate parameter estimates and the ability to achieve change-point positions and estimates simultaneously.     

Advance Selling in the Presence of Speculators and Forward‐Looking Consumers

This article examines the pricing policy of a monopolist seller who may sell in advance of consumption in a market that comprises of myopic consumers, forward‐looking consumers, and speculators. The latter group has no consumption value for the goods and is in the market with the sole objective of making a profit by reselling the purchased goods shortly after. Consumers, although homogeneous in terms of their valuations, are different with respect to their perspectives. We show that in an “upward” market where the expected valuation increases over time, the optimal pricing policy is an ex ante “static” one where the seller “prices into the future” and prices the myopic consumers out of the advance market. However, in a “downward” market where the expected valuation decreases over time, the seller adopts a dynamic pricing strategy except for the case when higher initial sales can trigger more demand subsequently and when the downward trend is not too high. In this case, the seller prefers an ex ante “static” pricing strategy and deliberately prices lower initially to sell to speculators. We identify the conditions under which the seller benefits from the existence of speculators in the market. Moreover, although the presence of entry costs is ineffective as an entry deterrence, we determine the conditions under which exit costs can rein in speculative purchase.