The Relative Fit measure for evaluating a blockmodel

Statistical Methods & Applications - A blockmodel is a network in which the nodes are clusters of equivalent (in terms of the structure of the links connecting) nodes in the network being...     

Will the Dismantlement of Early Retirement Schemes Increase Older Unemployment? A Competing‐risk Analysis for Belgium

On the basis of administrative data for Belgium, we estimate a competing‐risk model on transitions from employees aged 50 and older into unemployment, early and old‐age retirement while accounting for forward‐looking work disincentives. Our estimates are used to simulate a cut in early retirement benefits. Although this would enhance the financial sustainability of the social security system, our simulations predict a strong increase in unemployment among older blue‐collar workers in traditional industries. Members of private saving plans or occupational pension schemes and highly educated workers are predicted to move into the old‐age pension system.     

Musculoskeletal disorders: a new approach

Musculoskeletal disorders are still a major problem in daily occupational life. Despite the high incidence rates and important consequences for employees, employers and society, efficient preventive strategies seem to fail in efficiency. The reason may be found in approaching the issue via the classic post-factum analysis. The preventive measures are almost not implemented because of the low predictability to be injured which affects the awareness of the problem and the low identification with the improvement proposals. MSD belong to the cumulative diseases which require and anticipating strategy based on early detection of pre-indicating symptoms.     

Gender differences in entrepreneurial intentions: A TPB multi-group analysis at factor and indicator level

Previous research suggests that diverse factors predict gender differences in entrepreneurial intent. Our paper integrates and expands on previous findings using the Theory of Planned Behavior (TPB), including the deeper-level measurement model, allowing for a better understanding of the origin of differences. The results of a survey with business students indicate that the effect of gender on entrepreneurial intentions is mediated via personal attitudes and perceived behavioral control but not social norms. More precisely, vis-à-vis their male counterparts, women are more driven toward entrepreneurship by motives to ‘get organized’ (balance) that are less dominant in predicting personal attitude. Moreover, female students are somewhat less driven toward entrepreneurship by beliefs of internal control that are more dominant in predicting perceived control. Finally, while female students are also more motivated to comply with normative role models, this did not influence their entrepreneurial intentions over and above perceived behavioral control and personal attitude. We discuss both practical and theoretical implications of our findings.     

Perceived Quality of Life and Self-Rated Health among First-Year University Students

This study compares health status and qualityof life assessments of first-year universitystudents with those of their same-age workingcounterparts. Subjects and materials for eachgroup were gathered in 1999 from twocross-sectional data sets from the Swedishregion of Östergötland, covering malesand females aged 20–34 years. Subjects'perceived quality of life (QoL) and self-ratedhealth (SRH) were assessed on a 10-point scale(Ladder scale) and a five-point scale,respectively. Gender-based comparison revealedthat, for both males and females, first-yearuniversity students' average perceived QoL waslower than that of their working counterparts(p < 0.0001 in all instances). A higherproportion of students than expected ratedtheir health as ``average' or as ``low'(p < 0.0001). Perceived QoL was significantlycorrelated with SRH in both groups. Differencesin perceived QoL and SRH exist between studentsand their full-time working peers, and thedeterminants of these differences deservesgreater attention. Knowledge of thedeterminants of SRH and perceived QoL amonguniversity students might then be translatedinto sound and effective public-health practiceand intervention programs.     

Poverty persistence among the elderly in the transition from work to retirement

On the basis of matched Income Tax/Census data, the majority of the elderly poor in Belgium appear to be persistently poor. The question arises as to why this might be so. To the extent that individual characteristics such as abilities or tastes persist over time, these may also be the reason that individuals persist in poverty over time. In that case, one expects that once individual characteristics are controlled for, duration dependence in poverty becomes spurious. The alternative possibility is that the poverty experience itself has a causal impact on future poverty. This may be because of work disincentives, lack of investment in human capital and/or loss of motivation during the period of job search. The reasons for dependence in poverty are of interest for developing effective poverty-reducing policies. The estimation of a multiple-spell hazard model of transitions in and out of poverty, that allows for unobserved heterogeneity and a significant initial condition problem, supports the suggestion of true duration dependence in poverty. In Belgium the elderly unemployed are exempted from job search and lack any training or counselling from government agencies, while workers above 50 are given strong financial incentives to leave the labour market as soon as possible through different kinds of early retirement schemes.     

New analysis and computational study for the planar connected dominating set problem

The connected dominating set (CDS) problem is a well studied NP-hard problem with many important applications. Dorn et al. (Algorithmica 58:790–810 2010) introduce a branch-decomposition based algorithm design technique for NP-hard problems in planar graphs and give an algorithm (DPBF algorithm) which solves the planar CDS problem in \(O(2^{9.822\sqrt{n}}n+n^3)\) time and \(O(2^{8.11\sqrt{n}}n+n^3)\) time, with a conventional method and fast matrix multiplication in the dynamic programming step of the algorithm, respectively. We show that DPBF algorithm solves the planar CDS problem in \(O(2^{9.8\sqrt{n}}n+n^3)\) time with a conventional method and in \(O(2^{8.08\sqrt{n}}n+n^3)\) time with a fast matrix multiplication. For a graph \(G\), let \({\hbox {bw}}(G)\) be the branchwidth of \(G\) and \(\gamma _c(G)\) be the connected dominating number of \(G\). We prove \({\hbox {bw}}(G)\le 2\sqrt{10\gamma _c(G)}+32\). From this result, the planar CDS problem admits an \(O(2^{23.54\sqrt{\gamma _c(G)}}\gamma _c(G)+n^3)\) time fixed-parameter algorithm. We report computational study results on the practical performance of DPBF algorithm, which show that the size of instances can be solved by the algorithm mainly depends on the branchwidth of the instances, coinciding with the theoretical analysis. For graphs with small or moderate branchwidth, the CDS problem instances with size up to a few thousands edges can be solved in a practical time and memory space.     

Reinterpreting the relation between motherhood and paid work: second‐generation immigrant women in Norway

A pertinent question in contemporary Europe is whether the children of immigrants will reproduce the gender‐complementary practices and ideals of the immigrant generation, which often include strong expectations that women should prioritize family obligations over the pursuit of paid work. This article analyses the cultural and moral understandings at stake in second‐generation women's reflections on and practices of combining motherhood and paid work, and explores the space for negotiating such understandings in the family. The study is based on in‐depth interviews with second‐generation women of Pakistani descent in Norway, and interviews with some of their husbands. The findings show that the moral understandings and practices of the parent generation are not merely passed on to the second generation; rather they are challenged and reinterpreted in ways that support mothers' participation in paid work. The article argues that this change is facilitated by the cultural and institutional context that the Norwegian welfare state represents.     

Health-related determinants of perceived quality of life: a comparison between first-year university students and their working peers

This study compares aspects of the health-related behaviors and working life of first-year university students with those of their working counterparts and assesses the roles of these aspects as predictors of each groups' perceived quality of life (QoL). Subjects were taken from two cross-sectional data sets (a student survey and a population survey) from the Swedish central-western region of Osterg?tland. Male and female respondents aged 20-35 years were extracted and comparison were made considering in turn socio-demographic characteristics, health-related behaviors, exposure to abusive events at work and perceived QoL. University students smoked and used oral snuff in smaller proportions, they were not as frequent drinkers as their working counterparts, but they tended to drink more when they did drink. Threats and violence were less prevalent among students, but sexual harassment, were almost as common. The strongest predictors of perceived QoL for both groups are expected and former perceived QoL, followed by current self-rated health.     

Health behaviors,self-rated health,and quality of life: a study among first-year Swedish university students

The authors conducted a baseline investigation of male and female university students' health behaviors and self-rated health and quality of life (QOL). The study population consisted of all full-time, first-year students registered in a comprehensive study program offered at a Swedish university in autumn 1998. In spring 1999, the researchers sent self-administered questionnaires dealing with health status, lifestyle, and living conditions to the students at their home addresses. Male respondents used tobacco, were frequent drinkers, and engaged in binge drinking in larger proportions than expected by chance. A majority of the respondents rated their physical and psychological health as very good or good, but male students' ratings were higher than those of female students, whereas the males' average scores on self-perceived QOL were lower than those of females. Both male and female students' self-perceived QOL was more strongly associated with self-rated psychological than with physical health.