A Bayesian nonparametric model for Taguchi's on-line quality monitoring procedure for attributes

A Bayesian nonparametric model for Taguchi's on-line quality monitoring procedure for attributes is introduced. The proposed model may accommodate the original single shift setting to the more realistic situation of gradual quality deterioration and allows the incorporation of an expert's opinion on the production process. Based on the number of inspections to be carried out until a defective item is found, the Bayesian operation for the distribution function that represents the increasing sequence of defective fractions during a cycle considering a mixture of Dirichlet processes as prior distribution is performed. Bayes estimates for relevant quantities are also obtained.     

Asymptotic results for hybrids of empirical and partial sums processes

The present paper is devoted to the study of the hybrids of empirical and partial sums processes. In the first part, we present a synthesis of results related to these processes and their connection with the empirical and compound process. We obtain new results on the precise asymptotics in the law of the logarithm related to complete convergence and a.s. convergence, under some mild conditions, for the hybrids of empirical and partial sums processes. Finally, the weighted bootstrap processes and general hybrid processes are also discussed.     

Social attitudes in southern Spain to shape EU agricultural policy

The Common Agricultural Policy (CAP) is one of the most important European policies. Since its inception, the CAP has been reformed in response to high budgetary costs, international trade pressures and socio-economic changes. Despite the reforms, this policy did not always serve the best interests of farmers and provoked social criticisms. In anticipation of the post 2013 design, it is widely agreed that the forthcoming CAP should be more understandable to taxpayers. In this study, the social preferences towards the budgetary allocation of this policy, its equity, and its co-financing are investigated by means of the Choice experiment methodology to shed light on how to shape the future CAP to gain social legitimacy. Results reveal that the CAP post 2013 proposal is more in line with public preferences, although alternative measures are needed to tailor it effectively to regional needs.     

Special pension schemes for workers in arduous and hazardous jobs: Functions and conditions to ensure equal treatment

Most jurisdictions grant differentiated and more beneficial treatment – usually in the form of early retirement, and commonly under special pension schemes – to workers in arduous or hazardous jobs. Several justifications for such treatment have been advanced, including i) compensating the worker for the hardship, ii) protecting the worker from the hazard, and iii) realizing the principle of equality in the distribution of costs and benefits in the social security system. This article analyses these functions from a socioeconomic perspective and explains how early retirement for workers in arduous and hazardous jobs is necessary to ensure equality by treating “unequals unequally”, and in proportion to their inequality. Moreover, this article presents a precise formula to calculate when a worker should be allowed to retire, so that workers in occupational domains with a shorter life expectancy do not systematically enjoy lower expected benefits from the pension system while having contributed the same amount. Implications for the design and desirability of special pension benefits are discussed.     

The Sonoran Desert’s Domestic Bracero Programme: Institutional Actors and the Creation of Labour Migration Streams

This paper traces the journeys of male migrants to Empalme, Sonora, Mexico to uncover the development of the often overlooked domestic bracero programme that operated in conjunction with its well‐known international equivalent. Drawing on interviews and observations with ex‐braceros who met at a park near the Mexico‐US border, I examine their experiences and participation in Mexico’s domestic bracero program, an unintended and unexplored consequence of its international counterpart. The study shows how regulation and control were constantly reinvented at every step of the selection process by state actors and their affiliates in Mexico. The paper reveals how the oversupply of labour and modernization of agriculture in Sonora resulted in the development of a migration industry where local municipal leaders, coyotes, the state, and Mexican agribusiness capitalized from men’s displacement. The migration industry during the bracero selection process controlled who gained access to the United States labour market by capturing migrant labour en route to the United States in the process fueling a thriving cotton industry in the otherwise stagnant Sonoran Desert economy. The study concludes by taking the lessons from the historic domestic bracero programme to show one instance in which internal and international labour markets were closely interwoven. In the end, I call for more research that examines the relationship between markets on both sides of the border that uncovers how networks are not only structured by personal ties but also by state and market relations.     

Exposure to Violence,Coping Strategies,and Diagnosed Mental Health Problems Among Adults in a Migrant-Sending Community in Central Mexico

Deadly violence has spread throughout Mexico, affecting the well-being of citizens. What is the impact of this violence on the daily lives of Mexican adults? Building upon the stress process model, we used a mixed-methods approach to examine relationships between multiple indicators of exposure to and fear of violence and four diagnosed mental health outcomes, as well as self-rated mental health, in a Mexican community using the Survey of Health and Mexican Migration (456 surveys; 49 interviews). The multivariate models provide evidence that perceptions of insecurity are associated with diagnosed depressive episode, agoraphobia, alcohol abuse, a total count of mental health conditions, and poor self-rated mental health. Past victimization is associated with anxiety. Stress and coping behaviors did not formally mediate these violence–mental illness associations. The qualitative results confirm that residents fear violence and cope by adjusting their personal behaviors. These results foreshadow the emergence of mental health conditions as a critical public health concern for Mexicans living under the threat of violence.     

Urban park area and age determine the richness of native and exotic plants in parks of a Latin American city: Santiago as a case study

Plant diversity and composition in urban parks is determined by socio-economics, environmental, and ecological drivers. These drivers give rise to urban spaces with unique compositions of flora, consisting of planted and spontaneous species. The present study aimed to determine the contribution of native and exotic species in urban parks of a Latin American city, and to assess the related role of park area, age and socio-economic status. We also evaluated administration type (public or private) and the effect of environmental factors on plant richness. We hypothesized that the composition of park vegetation differs according to urban-rural gradient. To determine flora composition, two transects (100 m long by 1–3 m wide) per park were selected in 49 parks. In each of these, we identified all the vascular plants found (woody and herbs, planted and spontaneous), which were then classified as native or exotic. We conducted ANCOVAs in order to determine the effect of five independent variables and one factor, on native and exotic plant richness. Of 550 recorded species, 16.2% were native and 83.8% exotic. Number of plant species per park varied between 42 and 146. The parks are known urban habitats containing the highest planted and spontaneously occurring exotic diversity in the city of Santiago, contrasting with other types of habitats. Likewise, parks in Santiago are habitats with low levels of planted and spontaneously occurring native diversity, compared to the parks of Europe, America North and Asia. Ours results show that park area and age affected native plant richness, while exotic plant richness was determined only by park age. We rejected all other possible drivers. Finally, according to the low frequency of native species, we propose that Santiago’s parks could be gradually reoriented towards ex-situ conservation of native plants.