Local Influence Analysis for Skew-Normal Linear Mixed Models

In this article, we consider local influence analysis for the skew-normal linear mixed model (SN-LMM). As the observed data log-likelihood associated with the SN-LMM is intractable, Cook's well-known approach cannot be applied to obtain measures of local influence. Instead, we develop local influence measures following the approach of Zhu and Lee (2001 Zhu , H. , Lee , S. ( 2001 ). Local influence for incomplete-data models . J. Roy. Statist. Soc. Ser. B 63 : 111 – 126 .[Crossref] , [Google Scholar]). This approach is based on the use of an EM-type algorithm and is measurement invariant under reparametrizations. Four specific perturbation schemes are discussed. Results obtained for a simulated data set and a real data set are reported, illustrating the usefulness of the proposed methodology.     

A framework for studying practical production scheduling

The aim of this paper is to present what we believe are the most relevant findings and results regarding practical scheduling in order to define practical production scheduling and create a framework that helps researchers to study the various topics that fall under the umbrella of practical production scheduling and to identify the current state of knowledge for each topic. Studies from different fields were analysed and included in this paper, contributing significant knowledge to build a definition of practical production scheduling. Finally, we discuss the applicability that scheduling, as a task, could have in real companies.     

The Weibull Marshall–Olkin family: Regression model and application to censored data

We introduce a new class of distributions called the Weibull Marshall–Olkin-G family. We obtain some of its mathematical properties. The special models of this family provide bathtub-shaped, decreasing-increasing, increasing-decreasing-increasing, decreasing-increasing-decreasing, monotone, unimodal and bimodal hazard functions. The maximum likelihood method is adopted for estimating the model parameters. We assess the performance of the maximum likelihood estimators by means of two simulation studies. We also propose a new family of linear regression models for censored and uncensored data. The flexibility and importance of the proposed models are illustrated by means of three real data sets.     

School Integration of Migrant Children from the United States in a Border Context

Since 2008, about half a million children have arrived in Mexico from the United States, most of whom are US-born. However, due to limited statistical data, there have been few quantitative studies on their school integration. Using data from the 2017 School Integration Survey, conducted in 86 lower secondary schools in the Tijuana metropolitan area, we analyse the relationship between students’ liking of school and their binational school trajectories in this border city with high return migration. The results, based on a multivariate statistical analysis, show that students who studied in that country exhibit a lower liking of school, which correlates with a higher number of years of schooling in the U.S. and less time spent in Mexico since last arrival. Various mediating mechanisms are identified, such as limited Spanish proficiency, teacher indifference and lack of cultural identification with Mexico. The implications for education policy are also discussed.     

Nesting patterns among Neotropical species assemblages: can reserves in urban areas be failing to protect anurans?

Nestedness among species assemblages implies that sites of lower species richness are subsets of richer sites in a regional species pool. This nestedness is a reflection of a non-random process of species loss as a consequence of factors that promote the disaggregation of assemblages. The impoverishment of assemblage diversity is more often observed in fragmented landscapes. This non-random process has important implications for conservation. We recorded 95 species of anurans across 22 protected areas, of which 11 sites were in an urban matrix and 11 were in a non-urban matrix. We found that sites in the urban matrix had lower richness and high values of nestedness with no spatial autocorrelation among geographic distances and species composition. Thus, species were non-randomly distributed across the landscape and a nested pattern was documented from non-urban matrix sites to urban matrix sites. The impoverishment of assemblages toward the urban matrix sites may suggest that protected areas in an urban matrix are less suitable for anuran conservation than those in a non-urban matrix sites. Both the ecological revitalization of protected areas in urban matrix and protection of non-urban forested sites are needed for the conservation of Neotropical anurans.     

Political Influence and the Performance of Nonprofit Spanish Banks

This article presents empirical evidence about factors that influence the solvency of Spanish savings banks. It also studies whether the presence of politicians in their governance has led to lower solvency ratios and, consequently, to the current economic situation in the Spanish banking sector. We use multivariate regressions, taking the solvency ratio as the dependent variable; and efficiency, the coverage ratio, political influence, CEOs’ political influence, size, growth, and age as independent variables. Our results confirm that banking entities controlled by politicians resulted in poor performance, and political influence on the boards of savings banks led them to insolvency. The findings show that the non‐ownership structure of savings banks, the lack of best practice corporate governance mechanisms, and political presence have weakened them.     

The statistical properties of the networks of emigrants: the Ecuadorian case

This article shows that the threshold model appropriately analysed can explain the emigration process as a consequence of the network features, where the willingness to emigrate depends on the personal and household conditions borne by the emigrant. In such a case, the emigration process can be defined in terms of a Pólya schema, and the emigration rate converges almost surely to a random variable with a beta distribution, which fully characterizes the network (assimilation, integration, separation or marginalization). The model is applied to Ecuador, which has experienced an unprecedented wave of emigration since 1998. We show that, despite the massive exodus, the process does not constitute a diaspora, because Ecuadorians do not interact appropriately with natives.     

What Happens in Their Bedrooms Stays in Their Bedrooms: Staff and Residents' Reactions Toward Male–Female Sexual Intercourse in Residential Aged Care Facilities

This study aimed to investigate and compare the reactions of staff and residents of residential aged care facilities (RACFs) toward male–female sexual intercourse taking place in a private space within the facility. A total of 53 professionals and 47 residents from five RACFs located in Catalonia, Spain, were asked to reflect upon what they would think and do if they entered the bedroom of a resident and found him or her having sex with another resident of the opposite gender. The results suggest that male–female partnered sexual activity would generally be considered acceptable and would be respected, although some respondents called into question the appropriateness of such behavior and stated that they would react in a restrictive way. Overall, professionals appeared to be more accepting and permissive than were residents. Although our findings are broadly optimistic, they also suggest that male–female sexual intercourse may be considered an unwelcome sexual practice by some residents and professionals even if it occurs in a private space within the RACF. The fact that both staff and residents may also react in a negative way to the event could constitute a barrier to sexual expression among institutionalized older people.     

‘Su guagua no escucha nada’: Ecuadorian families confronting the deafness of a child

In accordance with the social model of disability, this study proceeded from the assumption that parents’ experiences of a child’s hearing impairment reflect the circumstances of their lives rather than anything innate in the impairment itself. Few studies have explored the influence both of culture and social structure and of families’ economic and social resources. We studied families’ experiences of the diagnosis of hearing loss in Ecuador, a multicultural country in which family ties are strong but where pronounced social and economic inequalities persist and where many people have no access to health care. The study shows how inequality – and in particular the experience of poverty – shapes families’ experiences of acquiring a diagnosis and of trying to accommodate a child with special needs.     

Political Participation and Late-Life Learning: A Cross-Cultural Study of Older People’s Participation in Seniors’ Interest Organisations in Australia and Spain

Understanding what older people learn from their civic participation is of critical importance both for individuals and organisations. This link has been neglected in prior research, and the evidence across diverse cultural contexts is particularly limited. However, the political context of older people’s life experiences and participation is important in their participation. The intent of the present study is to explore the learnings experienced by older people through participation in seniors’ interest organisations, across Australia and Spain. Participants included 52 active members of political organisations focused on issues for older people. A questionnaire was used for data collection; participants’ responses to an open-ended question regarding what they have learnt from their participation in seniors’ interest organisations are analysed here. Participants’ answers were subjected to a multi-stage thematic analysis. Findings show three key themes relating to learnings about themselves, such as self-improvement or skills or knowledge; learnings about others, such as cooperation with others and understand that people have different views; and learning about society, such as inequality and the need to fight for injustice. The findings suggest some interesting similarities and differences across contexts, which appears to reflect the different political contexts of the two countries.