A general long-term aging model with different underlying activation mechanisms: Modeling,Bayesian estimation,and case influence diagnostics

In this paper we propose a general cure rate aging model. Our approach enables different underlying activation mechanisms which lead to the event of interest. The number of competing causes of the event of interest is assumed to follow a logarithmic distribution. The model is parameterized in terms of the cured fraction which is then linked to covariates. We explore the use of Markov chain Monte Carlo methods to develop a Bayesian analysis for the proposed model. Moreover, some discussions on the model selection to compare the fitted models are given, as well as case deletion influence diagnostics are developed for the joint posterior distribution based on the ψ-divergence, which has several divergence measures as particular cases, such as the Kullback–Leibler (K-L), J-distance, L₁ norm, and χ²-square divergence measures. Simulation studies are performed and experimental results are illustrated based on a real malignant melanoma data.     

What Cruising Infants Understand about Support for Locomotion

“Cruising” infants can only walk using external support to augment their balance. We examined cruisers' understanding of support for upright locomotion under four conditions: cruising over a wooden handrail at chest height, a large gap in the handrail, a wobbly unstable handrail, and an ill‐positioned low handrail. Infants distinguished among the support properties of the handrails with differential attempts to cruise and handrail‐specific forms of haptic exploration and gait modifications. They consistently attempted the wood handrail, rarely attempted the gap, and occasionally attempted the low and wobbly handrails. On the wood and gap handrails, attempt rates matched the probability of cruising successfully, but on the low and wobbly handrails, attempt rates under‐ and overestimated the probability of success, respectively. Haptic exploration was most frequent and varied on the wobbly handrail, and gait modifications—including previously undocumented “knee cruising”—were most frequent and effective on the low handrail. Results are discussed in terms of developmental changes in the meaning of support.     

A model with long-term survivors: negative binomial Birnbaum-Saunders

Abstract

We propose a cure rate survival model by assuming that the number of competing causes of the event of interest follows the negative binomial distribution and the time to the event of interest has the Birnbaum-Saunders distribution. Further, the new model includes as special cases some well-known cure rate models published recently. We consider a frequentist analysis for parameter estimation of the negative binomial Birnbaum-Saunders model with cure rate. Then, we derive the appropriate matrices for assessing local influence on the parameter estimates under different perturbation schemes. We illustrate the usefulness of the proposed model in the analysis of a real data set from the medical area.     

Highly religious young Catholics in Northern Ireland: Renewing the Catholic landscape?

This article explores findings from a 2022 survey of students associated with the Catholic Chaplaincy at Queen's University, Belfast. It is the first study to investigate the beliefs, practices, and experiences of highly religious young Catholics in Northern Ireland. It presents survey findings on beliefs, practices, and influences on faith; dynamics of increased religiosity; and views on Church teachings on same sex relationships, euthanasia, sexual relationships, and abortion. Women are more likely to disagree with Church teachings on these issues than men. The survey confirms the importance of family socialization but finds that a substantial minority experience religious change at university. Respondents prioritize renewal but disagree on how to prompt it: some advocate greater ‘openness’ to women, LGBTQ+, and others perceived as marginalized; and others feel ‘evangelization’ should be emphasized. ‘Post-secular Catholicism’ is used as a foundation for reflections on religious persistence among Northern Ireland's young Catholics, raising questions about their potential role in renewing Ireland's Catholic landscape in light of the synodal process underway in the Church.     

Asymptotic confidence intervals in ridge regression based on the Edgeworth expansion

Ridge Regression techniques have been found useful to reduce mean square errors of parameter estimates when multicollinearity is present. But the usefulness of the method rest not only upon its ability to produce good parameter estimates, with smaller mean squared error than Ordinary Least Squares, but also on having reasonable inferential procedures. The aim of this paper is to develop asymptotic confidence intervals for the model parameters based on Ridge Regression estimates and the Edgeworth expansion. Some simulation experiments are carried out to compare these confidence intervals with those obtained from the application of Ordinary Least Squares. Also, an example will be provided based on the well known data set of Hald.     

The Chinese in Spain

During the past 15 years, the Chinese migrant community in Spain has grown significantly. Originally a small and dispersed population, it now ranks fourth among the migrant groups from non‐European Union (EU) countries. Its increasing presence in daily urban life is evident everywhere. Even though the Chinese community has a long history of settlement in Spain, the Spanish population still considers the Chinese as a closed and somewhat mysterious community. References to exaggerated stereotypes and prejudices regarding their activities and social organization can often be overheard in daily conversations. However, China, usually considered exotic and remote, has recently assumed greater importance in Spain's foreign policy. Thus, the Spanish Government has drawn up the Asia‐Pacific Framework Plan for 2000–2002 as part of its international policy considerations, thereby extending its interests to include areas well beyond its traditional foreign policy focus on Latin America. The Government's objectives are to expand its economic relations with Asia, to enhance trade and tourism with the area, expand the development cooperation with China, the Philippines, and Viet Nam — countries defined as top priorities for the Spanish Government — and to reinforce linguistic and cultural ties with these countries (Bejarano, 2002). In support of the Asia‐Pacific Framework Plan, the Casa Asia (House of Asia) was established in Barcelona in 2002, an institution created to organize academic and artistic activities in order to promote the knowledge of the region among Spaniards, and to foster political, economic, and cultural relations with Asia. The Government intends to pursue two important objectives related to the increasing commitments it is seeking to establish with China, and which are also of relevance to the overseas Chinese as the principal social actors involved. First, the strengthening of commercial exchanges with the People's Republic of China (PRC) are likely to benefit import‐export activities among the Chinese migrants, and be supported by their knowledge and practical experience of the respective social environments. Second, the dissemination of information on Spain is expected to establish and maintain stronger links in both directions. In the near future, these initiatives may also be instrumental in increasing the movement of people between China and Spain. Besides these primary objectives, the initiative pursues another important aim — the promotion of the social integration of the Chinese migrant community in the country. This paper addresses these issues, including data sources and their availability on Chinese migrants in Spain, the relevant local legal framework and how it influences the development of the Chinese migrant group, its sociodemographic composition, and migratory patterns. Finally, it addresses the changes in their economic activities.     

The Poisson–exponential distribution: a Bayesian approach

In this paper, we proposed a new two-parameter lifetime distribution with increasing failure rate. The new distribution arises on a latent complementary risk scenario. The properties of the proposed distribution are discussed, including a formal proof of its density function and an explicit algebraic formulae for its quantiles and survival and hazard functions. Also, we have discussed inference aspects of the model proposed via Bayesian inference by using Markov chain Monte Carlo simulation. A simulation study investigates the frequentist properties of the proposed estimators obtained under the assumptions of non-informative priors. Further, some discussions on models selection criteria are given. The developed methodology is illustrated on a real data set.     

Assessment of neighborhood satisfaction by residents of three housing types

A highly influential but often underemphasized determinant of residential satisfaction is how residents perceive and feel about their neighborhoods. In this study, factors representing different aspects of residents' neighborhoods were identified and examined in relation to their overall assessment of their homes and neighborhoods. Relationships among neighborhood aspects and overall housing and neighborhood assessments were examined separately for residents of conventional homes, mobile homes, and apartments. Results based on all residents indicated that evaluations of neighborhood aspects were unrelated to housing satisfaction, but were moderately related to positive sentiments and satisfaction with the neighborhood. Separate analyses by housing type revealed that neighborhood perceptions of apartment residents were influential in affecting housing satisfaction. For all residents, the neighborhood's attractiveness and pleasant-friendliness were the most important determinants of neighborhood acceptance and satisfaction. The results also indicated that despite sharing similar determinant patterns of neighborhood acceptance with the other two housing type groups, the basis for mobile home residents' evaluations was considerably less related to the factors identified as influential. The findings indicated that different neighborhood factors formed the basis for differences in overall housing and neighborhood satisfaction among residents living in the three housing types. However, since the type of housing does not by itself define a neighborhood, the differences that were found need to be considered in the larger context of other components of a neighborhood like economic and community characteristics typically associated with a specific structure type.     

Childlessness Among Older Women in the United States: Trends and Profiles

In the last 2 decades, the United States has seen an increase in childlessness and first births at older ages. Using the National Survey of Family Growth, we focus on women aged 35 – 44 who are voluntarily childless (expect no children and are fecund or contraceptively sterile). We compare these women to those who are involuntarily childless (fecundity impaired) and to those who are temporarily childless (expect children). Voluntary childlessness grew from 1982 (5%) to 1988 (8%), was stable up to 1995 (9%), and fell slightly in 2002 (7%). Voluntarily childless women have the highest income, prior work experience, and lowest religiosity compared to other women. This has been true since 1982, the earliest time point examined.