Conditional Quantile Estimation for Truncated and Associated Data

Abstract

In survival or reliability studies, it is common to have data which are not only incomplete but weakly dependent too. Random truncation and censoring are two common forms of such data when they are neither independent nor strongly mixing but rather associated. The focus of this paper is on estimating conditional distribution and conditional quantile functions for randomly left truncated data satisfying association condition. We aim at deriving strong uniform consistency rates and asymptotic normality for the estimators and thereby, extend to association case some results stated under iid and α-mixing hypotheses. The performance of the quantile function estimator is evaluated on simulated data sets.     

Gender differences in the experience of violence,discrimination, and stress hormone in African Americans: Implications for public health

Violence is more prevalent in African American communities than in other American communities. This has impacts not only on criminal justice interventions but also on the physical and mental health of these communities including their risk for acquiring life-threatening diseases. While many studies have focused on the effects of violence on African American males, we sought to understand the relative gender effects that violence has on African American females. This is of particular interest given the wide array of scientific literature suggesting maternal health has inter-generational health effects. Understanding gender differences associated with exposure to violence, depression, and immune function is an important step in understanding how young women perceive and internalize societal violence directed toward and around them. We analyzed a cohort of 557 young African American adults aged 18–25 years old from the Washington, DC area. We use sociological, epidemiological, mental health, computational biology, and quantitative genetics approaches to build a predictive portrait of the effects of violence on African American health. This study demonstrates that African American males and females experience different constellations of societal violence, that African American women report greater perception of racial and gender bias, and that cortisol, an indicator of stress response, is correlated to perceived discrimination. This work contributes to current understandings of how violence contributes to negative health outcomes and lays the foundation for a predictive model for sociological, health, and behavior risk that young African Americans encounter.     

The hydropolitical challenges of domestic water conservation. Palestine and Tunisia case studies

Southern Mediterranean area, particularly the Middle East and North Africa (MENA), has been facing social, economic, environmental and political challenges related to the water scarcity and quality. Within the European SWMED project, a socio-economic survey was conducted in Palestine and Tunisia, in order to explore the water conditions, and the social and economic situations of local families. The article illustrates the research design and implementation, as well as the main results that were used to select the appropriate sustainable water management solutions to respond to the hydropolitical issues. Due to the huge use of water in agriculture and the difficulty of reducing the water consumption in this sector, fostering tools for domestic water saving may be a winning strategy for facing water scarcity in MENA region.     

Factor Structure,Reliability, and Known Groups Validity of the German Version of the Childhood Trauma Questionnaire (Short-Form) in Swiss Patients and Nonpatients

The Childhood Trauma Questionnaire–Short Form is the most widely used instrument to assess childhood trauma and has been translated into 10 languages. However, research into validity and reliability of these translated versions is scarce. The present study aimed to investigate the factor structure, internal consistency, reliability, and known-groups validity of the German Childhood Trauma Questionnaire–Short Form (Bernstein & Fink, 1998). Six-hundred and sixty-one clinical and nonclinical participants completed the German Childhood Trauma Questionnaire–Short Form. A confirmatory factor analysis was conducted to assess the 5-factor structure of the original Childhood Trauma Questionnaire–Short Form. To investigate known-groups validity, the confirmatory factor analysis latent factor levels between clinical and nonclinical participants were compared. The original 5-factor structure was confirmed, with only the Physical Neglect scale showing rather poor fit. As a conclusion, the results support the validity and reliability of the German Childhood Trauma Questionnaire–Short Form. It is recommended to use the German Childhood Trauma Questionnaire–Short Form to assess experiences of childhood trauma.