Copula-graphic estimation with left-truncated and right-censored data

In Survival Analysis and related fields of research right-censored and left-truncated data often appear. Usually, it is assumed that the right-censoring variable is independent of the lifetime of ultimate interest. However, in particular applications dependent censoring may be present; this is the case, for example, when there exist several competing risks acting on the same individual. In this paper we propose a copula-graphic estimator for such a situation. The estimator is based on a known Archimedean copula function which properly represents the dependence structure between the lifetime and the censoring time. Therefore, the current work extends the copula-graphic estimator in de Uña-Álvarez and Veraverbeke [Generalized copula-graphic estimator. Test. 2013;22:343–360] in the presence of left-truncation. An asymptotic representation of the estimator is derived. The performance of the estimator is investigated in an intensive Monte Carlo simulation study. An application to unemployment duration is included for illustration purposes.     

The importance of the size of the social network and residential proximity in the reception of informal care in the European Union

This paper explores which factors affect the reception of informal care among those dependent people aged 65 and over in Europe, starting from the so-called Behavioural Model of Health Service Use introduced by Andersen. The data employed are drawn from the fourth wave of the Survey of Health, Ageing, and Retirement. The final sample consists of a total of 17,284 older dependent people of which 4529 (26.2%) received informal care. The main novelty is the incorporation of different characteristics of the social network of the individual (presence of children, size and residential proximity) among the factors that enable the reception of informal care. In particular the two latter aspects are combined in one sole indicator of distance to the social network. In addition to ‘traditional factors’ like age or degree of dependency, all the characteristics of the social network are found to influence the likelihood of receiving informal care. This reveals the need for taking into consideration the role played by social networks when governments design care programmes, especially in the current scenario of rising demand for care.     

Identifying beliefs behind boys’ use of mobile phones to monitor girlfriends and girls’ acceptance: a reasoned-action approach

Monitoring/controlling behaviours can be present in the early stages of an abusive relationship. Because of the need for evidence-based interventions grounded on behavioural models that identify the determinants of abusive behaviours, we applied the formative research of the reasoned action approach to: (1) conduct an elicitation study on the behavioural and normative beliefs that explain why boys use mobile phones to monitor their girlfriends and why these accept it, (2) analyse the items designed to assess the different constructs in the model and (3) carry out a preliminary exploration of the relationship between constructs. The sample was composed of 119 adolescent girls and boys between 14 and 18 years of age. Boys and girls seem to hold complementary beliefs that could produce a feedback loop that maintains the abusive behaviour. Parents are a protective factor against the behaviour whereas peers are not. Results on the item analysis and reliability of the scales were good. Intention seems an important predictor of the performance (51%) and acceptance (60%) of the behaviour and attitudes and perceived social norms of the intention (boys: 67%; girls: 65%), which suggests the appropriateness of the model for the prediction of the behaviour.     

Initial resource heterogeneity differences between family and non-family firms: Implications for resource acquisition and resource generation

A fundamental, but overlooked stream of resource-based theory (RBT) is the analysis of combinations of initial heterogeneous resource endowments with homogeneous resources that are acquired in the market. These combinations can generate heterogeneous, specific non-tradable resources, which are a potential source of superior competitive advantage and, hence, performance. In order to operationalize this idea empirically, we analyse the development of internationalization resources (considered a specific category of non-tradable resources) within family and non-family firms. Compared to non-family firms, we argue that family firms are able to combine a particular type of heterogeneous initial resource (i.e. familiness) with homogeneous tradable resources acquired in the market. This question is tested using a panel of family and non-family Spanish manufacturing firms for the period 1990 to 2010. As a result, this study contributes to the literature on RBT, extending previous theoretical and empirical research in this stream.     

Relationship between the degree of perineal trauma at vaginal birth and change in haemoglobin concentration

Background

Postpartum anaemia is a problem with high prevalence that significantly affects maternal recovery. Among the causal factors is perineal trauma. However, it is still not known what degree of perineal trauma produces a greater reduction of haemoglobin.

Multidimensional Poverty in Nicaragua: Are Female-Headed Households Better Off?

The recognition of poverty as a multidimensional concept has led to the development of more adequate tools for its identification. By allowing for subgroup and regional decompositions, those instruments are useful to allocate public action where most needed. This paper applies the Alkire and Foster (2011a) Multidimensional Poverty Index (MPI) to study single-mother and biparental families in Nicaragua, modifying its original structure to match more closely with the country’s current structural problems. Using Nicaragua’s last Demographic and Health Survey (DHS 2011/2012), our multidimensional poverty figures contrast with the government’s national poverty line estimates, suggesting that income poverty overestimates the number of poor people. Thus, our MPI can help as a complement for traditional consumption poverty and Basic Needs analysis; even extending the exploration by using other official household surveys. On the other hand, multidimensional poverty analysis found poverty dominance of male-headed families over single-mother and female-headed biparental families, which serves to contradict the notion of women being more vulnerable than men. Within the MPI, the most important contributor was the Living Standards dimension, composed by indicators directly related to housing conditions, and the second most deprived dimension was Education. A strong policy implication that arises from our findings is the reduction of the urban–rural poverty gap. Specifically, our findings exalt the need for governmental policies directed to reduce Nicaragua’s housing and educational deficits as a priority, particularly in rural areas.     

Exploring the Complex Associations Among Social Determinants of Health in Andalusia After the 2008 Financial Crisis

Social Indicators Research - In this study, we disentangle the complex relationship between structural and intermediary social determinants of health in Andalusia (Spain) after the period of...