A Test of Exogeneity Without Instrumental Variables in Models With Bunching

This paper presents a test of the exogeneity of a single explanatory variable in a multivariate model. It does not require the exogeneity of the other regressors or the existence of instrumental variables. The fundamental maintained assumption is that the model must be continuous in the explanatory variable of interest. This test has power when unobservable confounders are discontinuous with respect to the explanatory variable of interest, and it is particularly suitable for applications in which that variable has bunching points. An application of the test to the problem of estimating the effects of maternal smoking in birth weight shows evidence of remaining endogeneity, even after controlling for the most complete covariate specification in the literature.     

Clinical and behavioral evaluation of pathological gambling in Barcelona,Spain

This paper assesses both the clinical characteristics and gambling behavior of 45 pathological gamblers (40 male, 5 female, average age 41) in a psychiatric hospital in Barcelona, Spain. These pathological gamblers tend to have other addictions and psychiatric disorders in addition to their pathological gambling. Suicidal ideation and attempts were one of the most frequent complications with these patients. Slot and fruit machines were found to be the most preferred form of gambling. Loans and crime were frequently used by the gambler to finance his or her gambling. Nevertheless, the gambler is rarely aggessive, and legal problems resulting from serious crimes are the exception. The profile presentes is similar to that found among pathological gamblers in other countries.     

Modeling wind energy flux by a Birnbaum–Saunders distribution with an unknown shift parameter

In this paper, we discuss a Birnbaum–Saunders distribution with an unknown shift parameter and apply it to wind energy modeling. We describe structural aspects of this distribution including properties, moments, mode and hazard and shape analyses. We also discuss estimation, goodness of fit and diagnostic methods for this distribution. A computational implementation in R language of the obtained results is provided. Finally, we apply such results to two unpublished real wind speed data from Chile, which allows us to show the characteristics of this statistical distribution and to model wind energy flux.     

Robust multivariate control charts based on Birnbaum–Saunders distributions

Multivariate control charts are powerful and simple visual tools for monitoring the quality of a process. This multivariate monitoring is carried out by considering simultaneously several correlated quality characteristics and by determining whether these characteristics are in control or out of control. In this paper, we propose a robust methodology using multivariate quality control charts for subgroups based on generalized Birnbaum–Saunders distributions and an adapted Hotelling statistic. This methodology is constructed for Phases I and II of control charts. We estimate the corresponding parameters with the maximum likelihood method and use parametric bootstrapping to obtain the distribution of the adapted Hotelling statistic. In addition, we consider the Mahalanobis distance to detect multivariate outliers and use it to assess the adequacy of the distributional assumption. A Monte Carlo simulation study is conducted to evaluate the proposed methodology and to compare it with a standard methodology. This study reports the good performance of our methodology. An illustration with real-world air quality data of Santiago, Chile, is provided. This illustration shows that the methodology is useful for alerting early episodes of extreme air pollution, thus preventing adverse effects on human health.     

Voluntary childlessness in a society reluctant to change

Voluntary childlessness constitutes a social and generational rupture from tradition and culture, with significant effects on the reproduction of the so-called life and family cycle. This study aims at understanding the reasons why people decide to remain childless and the social pressures that this decision generates. A qualitative phenomenological study was conducted on the emerging decision of non-motherhood and non-fatherhood based on semi-structured interviews with 56 people who autonomously made the decision to opt out of parenthood. This paper underscores the multiple biographical situations involved in the decision, in addition to the concerns about personal development and future. The current social crisis context serves as a means of justification to lessen social and family pressure. We conclude that people who have made this decision promote a different meaning from that of reproduction as a mechanism of the social order.     

Being Under Pressure to Sext: Adolescents' Experiences,Reactions, and Counter-Strategies

This study explored adolescents' experiences of being under pressure to sext (sending nude images), offering insights into what situations adolescents view as pressuring, how adolescents react to the pressure, and what counter-strategies they use. Written statements from 225 adolescents (age 13–16 years, M = 14.4 years, SD = 0.93) were analyzed using thematic analysis. Results indicated a range of situations including both explicit and implicit pressure. The pressure elicited different emotional responses, including severe physical and psychological reactions, becoming distressed, and being seemingly unconcerned. A majority of the adolescents reported successful strategies on how to ward off the unwanted sexual requests. This study provides insight into how young people cope with potentially harmful situations online.     

Variations in horizontal and vertical individualism-collectivism in four regions of Mexico / Variaciones en el individualismo-colectivismo horizontal y vertical en cuatro regiones de México

Cultures can be analysed through cultural syndromes (shared patterns of beliefs, attitudes, norms, roles and values organized around a theme). One of these syndromes, individualism-collectivism, distinguishes collectivist cultures, which prioritize collective over individual interests, from individualist cultures, which value individual autonomy, achievement and freedom. These dimensions intersect with the horizontal-vertical syndrome, where verticality means the preference for a society organized by hierarchies, in contrast to a horizontal culture, which privileges equality. This paper explores these dimensions using a new instrument in a sample of 990 participants from four regions in Mexico. The results of exploratory and confirmatory factorial analyses show four theoretically congruent factors with adequate levels of internal consistency reaching metric equivalence criteria in three of the four samples. The scores show greater support for horizontal individualism and less support for vertical collectivism. These results are discussed within the context of a cultural shift towards individualism.     

New sign language new(S): the globalization of sign language in the smartphone era

Languages are dynamic and change over the years. Changes in sign languages have been usually initiated to accommodate the needs of the local Deaf community. With the increase in smartphone use, sign languages are influenced not only by the local Deaf community, but also by foreign Deaf people on the other side of the screen, regardless of their location. Smartphones influence the sign language itself and the Deaf community by connecting different communities of Deaf people through messages, shared information and experiences, and news delivery. The popularity of this technology among Deaf communities is a social phenomenon emerging from Deaf people themselves. Smartphones may promote the globalization of sign language, shortening distances between Deaf communities around the world.     

Analysis of the workload of bank tellers of a Brazilian public institution

During the last decades there have been many changes in the banking sector organization. It has been also observed the mutual growing of musculoskeletal and mental disorders. This study investigated the workload of bank tellers at a Brazilian public institution. It was performed the Ergonomic Work Analysis (EWA). Three employees participated in this study. During the analysis process, three research instruments were applied: Inventory of Work and Risk of Illness, Yoshitake Fatigue Questionnaire and Nordic Musculoskeletal Questionnaire, beyond the realization of footage recordings and the self-confrontation. The results indicated the existence of an excess of workload on the evaluated workstations, mainly in relation to mental order constraints, that overlaps the physical aspects. Thereby it was found that the employees tend to adopt strategies trying to reduce the impacts of the excess of workload, in order to regulate it.