Projecting Rates of Spread for Invasive Species

All else being equal, the faster an invading species spreads, the more dangerous its invasion. The projection of spread rate therefore ought to be a central part of the determination of invasion risk. Originally formulated in the 1970s to describe the spatial spread of advantageous alleles, integrodifference equation (IDE) models have since been co-opted by population biologists to describe the spread of populations. More recently, they have been modified to include population structure and environmental variability. We review how IDE models are formulated, how they are parameterized, and how they can be analyzed to project spread rates and the sensitivity of those rates to changes in model parameters. For illustrative purposes, we apply these models to Cytisus scoparius, a large shrub in the legume family that is considered a noxious invasive species in eastern and western North America, Chile, Australia, and New Zealand.     

Socio-demographic Components of Eudaimonic Well-Being: A Survey in an Italian Province

This work is part of a well-established strand of study about quality of life (QoL) and the different methodologies for its quantitative evaluation. The study focuses on a specific dimension of QoL, that of the eudaimonic well-being (EuWB), with two main objectives. On the one hand, we try to clarify how EuWB can be framed in the systematizations of QoL proposed in the literature. Its relation to the concept of subjective well-being is discussed, and the need to distinguish such approach from the so-called hedonic dimension of QoL is highlighted. On the other hand, the paper aims to investigate the link between the perception of EuWB and individual socio-demographic characteristics through a quantitative analysis based on the results of a survey. The survey carried out in Central Italy in 2010, involved a sample of 1,134 individuals, which are classified according to their perception of EuWB. An analysis of the socio-demographic characteristics within the EuWB groups is then performed in order to investigate the association between these variables and the perception of EuWB. Results are discussed with respect to the evidences from similar surveys found in the literature. The analysis confirms the influence of some variables on the perception of EuWB, yet it underlines the difficulty in comparing different studies on QoL without clarifying to which of the different declensions of this concept the survey methodology refers to.     

Likelihood-Based Inference for Semi-Competing Risks

Consider semi-competing risks data (two times to concurrent events are studied but only one of them is right-censored by the other one) where the link between the times Y and C to non-terminal and terminal events, respectively, is modeled by a family of Archimedean copulas. Moreover, both Y and C are submitted to an independent right censoring variable D. We propose to estimate the parameter of the copula and some resulting survival functions using a pseudo maximum likelihood approach. The main advantage of this procedure is that it extends to multidimensional parameters copulas. We perform simulations to study the behavior of our estimation procedure and its impact on other related estimators and we apply our method to real data coming from a study on the Hodgkin disease.     

Investing with Prejudice: the Relationship Between Women's Presence on Company Boards and Objective and Subjective Measures of Company Performance

This paper presents a comprehensive archival examination of FTSE 100 companies in the period 2001–2005, focusing on the relationship between the presence of women on company boards and both accountancy‐based and stock‐based measures of company performance. Consistent with work by Adams, Gupta and Leeth this analysis reveals that there was no relationship between women's presence on boards and ‘objective’ accountancy‐based measures of performance (return on assets, return on equity). However, consistent with ‘glass cliff’ research there was a negative relationship between women's presence on boards and ‘subjective’ stock‐based measures of performance. Companies with male‐only boards enjoyed a valuation premium of 37% relative to firms with a woman on their board. Results support claims that women are found on the boards of companies that are perceived to be performing poorly and that their presence on boards can lead to the devaluation of companies by investors. Yet the findings also indicate that perceptions and investment are not aligned with the underlying realities of company performance.     

Marriage Patterns of the Foreign‐Born Population in a New Country of Immigration: The Case of Spain1

We use 2001 Spanish census microdata and multivariate logistic regression analysis to explore differences in marriage patterns between the foreign‐born population in Spain, a country that has experienced a dramatic increase in international migration rates in the last decade. In particular, we examine separately the prevalence of being in a consensual and in an endogamous union for a selected and representative group of origins. Results show that after controlling for individual and union characteristics, major differences in cohabitation between groups disappear while major differences in endogamy prevail. This suggests that, when appropriate data are available, future research should take into account contextual factors.     

Betwixt and between the market and the state: Israeli students' welfare attitudes in comparative perspective

Analysing comparable samples of students from the Cross-Cultural Variations in Distributive Justice Perception (CVDJP) project, we explore the multidimensionality of attitudes towards the welfare state in Israel compared with countries from liberal and social-democratic welfare regimes (the USA, Canada-Ontario, Sweden, Norway and The Netherlands). We derive six different attitudinal dimensions that constitute two distinct sets of opposing welfare ideological frames. The first set, market-based ideology, entails three coexisting criteria: individualism, internal attribution of inequality, and work ethic. The second set, welfare-statist ideology, entails three additional coexisting criteria: egalitarian redistribution, external attribution of inequality, and broad scope of welfare. Along with structural similarities, we find considerable variation in levels of aggregate attitudes across the different types of welfare regimes. Israeli respondents stand out because of their strongly ambivalent welfare attitudes. While scoring higher than respondents from the liberal regimes on market-based measures, they paradoxically record similarly high scores (comparable to social-democratic regimes) on state-based measures. On one criterion – attribution of inequality to external causes – Israeli respondents even score higher than respondents from both liberal and social-democratic regimes. We consider potential explanations for this ambivalence and suggest possible directions for further research.