Effects of prenatal exposure to abnormal rainfall on cognitive development in Vietnam

Population and Environment - The foetal origins hypothesis postulates that shocks while in utero can have long-term detrimental effects on the health and human capital formation of children. Using...     

Efficient Computation of Reduced Regression Models

We consider settings where it is of interest to fit and assess regression submodels that arise as various explanatory variables are excluded from a larger regression model. The larger model is referred to as the full model; the submodels are the reduced models. We show that a computationally efficient approximation to the regression estimates under any reduced model can be obtained from a simple weighted least squares (WLS) approach based on the estimated regression parameters and covariance matrix from the full model. This WLS approach can be considered an extension to unbiased estimating equations of a first-order Taylor series approach proposed by Lawless and Singhal. Using data from the 2010 Nationwide Inpatient Sample (NIS), a 20% weighted, stratified, cluster sample of approximately 8 million hospital stays from approximately 1000 hospitals, we illustrate the WLS approach when fitting interval censored regression models to estimate the effect of type of surgery (robotic versus nonrobotic surgery) on hospital length-of-stay while adjusting for three sets of covariates: patient-level characteristics, hospital characteristics, and zip-code level characteristics. Ordinarily, standard fitting of the reduced models to the NIS data takes approximately 10 hours; using the proposed WLS approach, the reduced models take seconds to fit.     

Bystander Attitudes to Prevent Sexual Assault: A Study of College Students in the United States,Japan, India,Vietnam, and China

College women are at a high risk of sexual assault. Although programs that aim to change bystander behaviors have been shown to be potentially effective in preventing sexual assault on campuses in the United States, little is known about bystander behaviors outside of the United States. The purpose of this study was to explore and compare factors affecting bystander behaviors regarding sexual assault intervention and prevention among undergraduate students in the United States, Japan, India, Vietnam, and China. A total of 1,136 students participated in a self-reported survey. Results demonstrate substantial variations across countries. Bystander behaviors are associated with multilevel factors, including gender, knowledge of individuals who have experienced a sexual assault, and knowledge about campus or community organizations.     

The moral middle-class in market socialism: An investigation into the personhood of women working in NGOs in Vietnam

The paper uncovers the values that Vietnamese women produce and accumulate from the NGO sector to acquire a morality central to their middle-class identity. They present an idea of a moral middle-class that conforms to the neoliberal criteria of self-reliance and self-optimisation within the economic segment, in which values are generated in the forms of sacrifice and giving away. I argue that this idea is associated with a mode of governmentality whereby the socialist state shapes the moral subject for the sake of governance in the context of marketisation. Morality, as a governing device, motivates and polices women's compliance with their subordinate position. This paper presents findings that illustrate the slipperiness of the notion of middle-class between theories and practices and from women's perspectives. Perceived in part in terms of women's sacrifices, this study illustrates how middle-class identity is negotiated through moral, gender and class divisions in a post-socialist society.     

Will It Help? Identifying Socialization Discourses That Promote Sexual Risk and Sexual Health Among African American Youth

Because much of the existing research examining sexual communication to African American youth focuses on demographic and parental factors predicting sexual risk behaviors, less is known about factors predicting sexual health, and little is understood about the contributions of peer communications. The current study aimed to expand existing approaches by assessing which socialization discourses communicated by parents and peers contribute to sexual risk and health outcomes (sexual assertiveness, positive sexual affect, and condom self-efficacy). Participants were 631 African American undergraduates (73% female) who indicated the extent to which they had received from their parents and peers each of 28 messages representing four cultural discourses: abstinence, relational sex, sex positive, and gendered sexual roles. As expected, parents were perceived to emphasize relational sex and abstinence messages more than peers, and peers were perceived to communicate sex-positive and gendered sex role messages more than parents. Greater exposure to abstinence messages predicted lower levels of sexual experimentation, whereas exposure to sex-positive messages predicted higher levels. In addition, exposure to relational sex and sex-positive messages predicted higher levels of sexual assertiveness and positive sexual affect. Implications are discussed concerning sexual communications that could help Black youth develop healthy sexual perspectives.     

Self‐Competence and Depressive Symptoms in Middle–Late Adolescence: Disentangling the Direction of Effect

This study examined the temporal relation between self‐competence (academic, social, athletic, physical appearance, and close friend) and depressive symptoms in a large, diverse community sample of 636 adolescents. Surveys were administered to all 10th‐ and 11th‐grade students at participating high schools at baseline (mean age = 16.10, SD = .71) and 1 year later. Girls reported higher levels of self‐competence in close friendships and more depressive symptoms, whereas boys reported higher levels of self‐competence in athletics and physical appearance. However, there were no gender differences in the associations between self‐competence and depressive symptoms. Results from autoregressive, cross‐lagged path analyses indicated that depressive symptoms predicted self‐competence more consistently than self‐competence predicted depressive symptoms during middle–late adolescence. Implications for prevention are discussed.     

Maximal inequalities and strong law of large numbers for sequences of m-asymptotically almost negatively associated random variables

In this paper, we establish some inequalities for maximum of partial sums of m-asymptotically almost negatively associated random variables. With the help of these inequalities we prove some strong law of large numbers.     

Contributions of Divergent Peer and Parent Sexual Messages to Asian American College Students' Sexual Behaviors

Receiving more parent sexual communication is generally linked to a later age of first sexual intercourse and less sexual risk taking. However, Asian American youth report minimal parent sexual communication, later sexual initiation, and fewer sexual risks than their counterparts. What contributes to this unexpected pattern of sexual communication and sexual behaviors? To answer this question, we surveyed 312 Asian American college students ages 17 to 22 on their sexual behaviors, parent sexual communication, and peer sexual communication. Assessment of parent and peer sexual communication was completed via a measure in which participants rated the frequency with which they had received each of 22 sexual messages from each source. Young women generally received more messages promoting abstinence, traditional sex roles, and sex within a relational context than their male counterparts. Young men, however, reported greater parent and peer communications that were accepting of casual sex. Exposure to peer messages that were accepting of casual sex was associated with more sexual partners, casual sex encounters, and sexual experience. Being older, being raised outside the United States, being less religious, and being homosexual was each predictive of more sexual experience. Implications regarding the role of culture and gender on sexual socialization are discussed.     

In search of missing time: A review of the study of time in leadership research

Many studies describe leadership as a dynamic process. However, few examine the passage of time as a critical dimension of that dynamism. This article illuminates this knowledge gap by conducting a systematic review of empirical studies on temporal effects of leadership to identify if and how time has been considered as a factor. After synthesizing key findings from the review, the article discusses methodological implications. We propose that a computational science approach, particularly agent-based modeling, is a fruitful path for future leadership research. This article contributes to leadership scholarship by shedding light on a missing variable (time) and offering a novel way to investigate the temporal, dynamic, emergent, and recursive aspects of leadership. We demonstrate the usefulness of agent-based modeling with an example of leader-member exchange relationship development.