Women’s Employment Status,Coercive Control,and Intimate Partner Violence in Mexico

Findings from previous studies examining the relation between women’s employment and the risk of intimate partner violence have been mixed. Some studies find greater violence toward women who are employed, whereas others find the opposite relation or no relation at all. I propose a new framework in which a woman’s employment status and her risk of violent victimization are both influenced by the level of control exercised by her partner. Controlling men will actively prevent women from working and are also more likely to physically harm their partners. Using a statistical model in which the effect of omitted characteristics on women’s employment and their risk of violence are allowed to be correlated reverses the estimated association between employment and violence. The final results show that employment reduces women’s risk of violence. Data for the study are drawn from a sample of over 30,000 Mexican women in intimate relationships. The findings have broad implications given the increase in female labor force participation in many parts of the world.     

A two-stage procedure for selecting the best of k exponential distributions

The problem of selecting the best of k exponential distributions with different guarantee times and the same unknown variance is considered. A two-stage procedure, similar to the one considered by Bechhofer, Dunnett and Sobel (1954), is given. Some specific guidelines for selecting the first-stage sample size are also given.     

A Lean transportation approach for improving emergency medical operations

Abstract

This paper extends the approach of Lean transportation to improve the performance of emergency medical processes (EMP) by adapting its main concepts into the main characteristics of the EMP environment. The paper is based on an inductive theory-building process initiated from a case study in the field of emergency medical services. The development of the suggested performance improvement approach triggered from an exhaustive analysis of a process involved and an exploratory review of the existing improvement approaches available. The process of concern can be described as a specialized transportation process, where human lives are at risk. Its characteristics led to a natural application of Lean transportation. The results include, a novel approach for improving the agility and efficient EMS processes. This is validated with an application for improving ambulance response times and turnaround times of the Red Cross operations located in Monterrey, Mexico. The approach proved to be an integrated scheme for identifying waste opportunities at a systems level. This characteristic is important to let operations management prioritize improvement efforts in a limited budget situation. This work suggests the application of the emerging Lean transportation approach for increasing the agility performance of EMS processes.     

UNRAVELING THE ECONOMIC PARADOX OF FEMALE-HEADED HOUSEHOLDS IN MEXICO: The Role of Family Networks

An extensive amount of research has shown that female-headed households are among the most disadvantaged in the United States. By contrast, households headed by single mothers in Mexico have median per capita income levels that are the same or higher than those headed by men and are no more likely to be living in poverty. These findings are surprising, given the many disadvantages that Mexican women face in the labor market and the added difficulties for single mothers of managing work and family life. We propose four explanations for the relatively high income levels of female-headed households in Mexico: (1) female heads' more advanced stage in the life course compared to male heads, (2) the greater financial support they receive from extended family members, (3) the international migration of the partners of female heads, and (4) a selection process whereby only women with sufficient income head their own households, while others move into households headed by someone else. Using a nationally representative survey we find that economic transfers from relatives living within the country and abroad, as well as a selection effect explain female-headed households' relatively high income.     

Self‐modelling regression for longitudinal data with time‐invariant covariates

The authors propose the use of self‐modelling regression to analyze longitudinal data with time invariant covariates. They model the population time curve with a penalized regression spline and use a linear mixed model for transformation of the time and response scales to fit the individual curves. Fitting is done by an iterative algorithm using off‐the‐shelf linear and nonlinear mixed model software. Their method is demonstrated in a simulation study and in the analysis of tree swallow nestling growth from an experiment that includes an experimentally controlled treatment, an observational covariate and multi‐level sampling.     

How Job Characteristics Affect International Migration: The Role of Informality in Mexico

Despite the importance given to employment opportunities as a primary motive for migration, previous studies have paid insufficient attention to the kinds of jobs that are more likely to retain workers in their countries of origin. We use information from a panel survey of Mexican adults to examine how job characteristics affect the risk of international migration. The sampling strategy and overall size of the survey allow us to analyze the effect of employment characteristics on migration from urban areas, which have much greater labor market diversity, and to separate our analysis by gender. We also distinguish migrants according to whether they migrate for work or for other reasons. We find informality to be a significant predictor of international migration. Even after controlling for individual factors including workers’ wages, as well as various household- and community-level predictors, we find that workers employed in the informal sector have significantly higher odds of migrating than their counterparts in the formal sector. The pervasive nature of informality in many developing countries from which a high proportion of international migrants originate may therefore create a constant supply of workers who are predisposed to migrate. Our findings thus have important implications for a proper understanding of the effects of economic development on migration.     

Algebraic and combinatorial properties of ideals and algebras of uniform clutters of TDI systems

Let \(\mathcal{C}\) be a uniform clutter and let A be the incidence matrix of \(\mathcal{C}\). We denote the column vectors of A by v ₁,…,v _q . Under certain conditions we prove that \(\mathcal{C}\) is vertex critical. If \(\mathcal{C}\) satisfies the max-flow min-cut property, we prove that A diagonalizes over ? to an identity matrix and that v ₁,…,v _q form a Hilbert basis. We also prove that if \(\mathcal{C}\) has a perfect matching such that \(\mathcal{C}\) has the packing property and its vertex covering number is equal to 2, then A diagonalizes over ? to an identity matrix. If A is a balanced matrix we prove that any regular triangulation of the cone generated by v ₁,…,v _q is unimodular. Some examples are presented to show that our results only hold for uniform clutters. These results are closely related to certain algebraic properties, such as the normality or torsion-freeness, of blowup algebras of edge ideals and to finitely generated abelian groups. They are also related to the theory of Gröbner bases of toric ideals and to Ehrhart rings.     

Accompaniment in a Mexican immigrant community: Conceptualization and identification of biopsychosocial outcomes

Taller de Jose (TDJ) offers accompaniment in a Mexican neighborhood in Chicago, helping service participants navigate health, judicial, and social service systems. Using a community-based participatory approach, the current study conceptualizes the accompaniment service and identifies psychosocial outcomes. Focus groups with service participants and staff were conducted, using a grounded theory approach. The data provides support for a conceptual model of accompaniment based on interdisciplinary knowledge in ministry, social work, and public health; and a consideration of social context, values, and outcomes such as increased social support, knowledge of community resources, and improved self-efficacy.     

PERFORMANCE DIFFERENCES IN THE USE OF GRAPHIC AND TABULAR DISPLAYS OF MULTIVARIATE DATA

It has been suggested that graphically displayed multivariate data help decision makers better understand information they are called on to analyze. This study compares judgments made from one recently suggested multivariate display technique with judgments made from traditional tabular displas of financial figures. Significant differences in task performance are found to be related both to differences in the stimulus sets and to individual differences among the subjects. Our results suggest that the relative contribution of graphic displays to decision making may vary considerably from situation to situation.