Personal networks of prisoners prior to incarceration: A comparison with the general Dutch population

This study examines inmates’ core discussion network prior to their incarceration. The core discussion network consists of the immediate social circle of relatively strong ties. The aims of the study are twofold: (1) to describe inmates’ core discussion network prior to their incarceration in terms of network structure, relationship quality and embedded socioeconomic resources; (2) to compare inmates’ core discussion network with the core discussion network of the general Dutch population. Data are analyzed from the Prison Project (n = 1909) and the Survey of the Social Networks of the Dutch (n = 394). Compared with the general Dutch population, prior to incarceration, prisoners generally have a core discussion network that is similar to or even better with respect to network structure and relationship quality. However, prisoners’ core discussion network members seem to lack socioeconomic resources.     

A note on the duality between matchings and vertex covers in balanced hypergraphs

We present a new Min-Max theorem for an optimization problem closely connected to matchings and vertex covers in balanced hypergraphs. The result generalizes K?nig’s Theorem (Berge and Las Vergnas in Ann N Y Acad Sci 175:32–40, 1970; Fulkerson et al. in Math Progr Study 1:120–132, 1974) and Hall’s Theorem (Conforti et al. in Combinatorica 16:325–329, 1996) for balanced hypergraphs.     

Informal Mentoring at Work: A Review and Suggestions for Future Research

This paper reviews the literature on informal mentoring at work. Based on two basic premises of interpersonal relationships, it discusses four promising areas in current mentoring research that could be cultivated further by future research. The first premise that we hold is that relationships never exist in a vacuum. Traditionally, however, mentoring literature has often overlooked the context of mentoring. We propose that the developmental network approach can be further extended to gather more insight into the interplay between mentoring dyads and their context. Also, mentoring literature could pay more attention to temporal influences in mentoring studies. The second premise that is applied is that relationships are not only instrumental in nature. However, mentoring research to date has mostly applied a one‐sided and transactional view to mentoring. Relational mentoring theory could be helpful in examining relational motivations of both members. Also, mentoring literature can achieve more explanatory power by examining the underlying mechanisms of mentoring, next to social exchange principles, that cause these developmental changes. In summary, in each of these four research areas, we identify and discuss fundamental questions and developments in research that can advance mentoring theory and practice.     

Ready,Willing, and Able: Contraceptive Use Patterns Across Europe

An “East–West” divide in contraceptive use patterns has been identified across Europe, with Western European countries characterized by the widespread use of modern contraception, and Central and Eastern European countries characterized by a high prevalence of withdrawal, the rhythm method, or abortion. Building on the Ready–Willing–Able framework, this study aims to gain more insight into the micro- and macro-level socioeconomic, cultural, and technological determinants underlying contraceptive use. Data from the Generations and Gender Survey (2004–2011) covering four Western and seven Central and Eastern European countries are used, and multinomial multilevel analyses are performed. Results reveal that individuals who intend to delay parenthood are more likely to use any contraceptive method, whereas holding more traditional values and having a lower socioeconomic status are associated with a higher likelihood of using no or only traditional methods. Regional reproductive rights and gender equality interact in complex ways with these associations. At minimum, our results underline the complexity of the processes underlying the persistent difference in contraceptive use across Europe.     

Counting the Population or Describing Society? A Comparison of English and Welsh and French Censuses

Data collected at household level in censuses are used for a wide range of purposes including practical planning and academic analysis of changing social conditions. Comparability is a core demographic value, and to understand the limits of the comparability of census data across time and space, it is important to recognise if, how and why, concepts and definitions change between censuses. This paper examines definitions of the household in censuses in England and Wales (E&W) and France from 1960 to 2012 in order to investigate how census definitions have changed and to examine the drivers of such changes. Two research methods were used: (1) longitudinal analyses of census documentation since the 1960s and (2) in-depth interviews with key informants oriented around respondents’ roles in the collection and/or use of household data from censuses and surveys. We identify two contrasting national approaches to the data collection exercise that is called a census, which reflect political and institutional differences. These differences call into question the comparability of some aspects of census data across national boundaries, despite increased harmonisation of approaches to data collection. By comparing the evolution of the definitions of the “household” in censuses, we develop insight into the diversity of the priorities of census commissioners and designers, and consider the broader implications of this for producing comparable data.     

Improved nearest neighbor classifiers by weighting and selection of predictors

Nearest neighborhood classification is a flexible classification method that works under weak assumptions. The basic concept is to use the weighted or un-weighted sums over class indicators of observations in the neighborhood of the target value. Two modifications that improve the performance are considered here. Firstly, instead of using weights that are solely determined by the distances we estimate the weights by use of a logit model. By using a selection procedure like lasso or boosting the relevant nearest neighbors are automatically selected. Based on the concept of estimation and selection, in the second step, we extend the predictor space. We include nearest neighborhood counts, but also the original predictors themselves and nearest neighborhood counts that use distances in sub dimensions of the predictor space. The resulting classifiers combine the strength of nearest neighbor methods with parametric approaches and by use of sub dimensions are able to select the relevant features. Simulations and real data sets demonstrate that the method yields better misclassification rates than currently available nearest neighborhood methods and is a strong and flexible competitor in classification problems.     

Are national levels of employee harassment cultural covariations of climato-economic conditions?

Conflict in a workgroup turns into harassment if a group member is persistently confronted with negative acts with few possibilities to retaliate. Cross-national differences in such intragroup harassment are considerable but wait to be understood. In this study, survey data from 44,836 employees in 44 countries revealed that a cultural in-group orientation was associated with lower employee harassment. In addition, and in agreement with Van de Vliert's climato-economic theory of culture, workforces reported more harassment in poorer countries with more demanding climates of colder-than-temperate winters, hotter-than-temperate summers, or both. Finally, it was found that the impact of climato-economic hardships on harassment suppressed the impact of cultural in-group orientation on harassment. Using the regression equation obtained for the sample of 44 countries, national levels of employee harassment for a broader pool of 103 countries were estimated and scrutinized for their validity for future research. Data from the World Values Surveys were used to validate the estimations. The results provide the basis for a further hypothesis, that employee harassment is more prevalent in countries with either survival or self-expression cultures than in countries with cultures that are intermediate between those two extremes. The results have implications for prevention and remedial measures.     

Experience with an electricity market simulation tool

A successful experience to train power producers on pool-based electricity markets presented. Trainees are arranged in groups and assigned, at random, a set of generators. They play the role of power producers and compete against each other with the target of maximizing their own profits. They have to bid in terms of price and quantity to try to sell energy to the consumers through the market. The trainer plays the role of the market operator. A market simulator and a computer communication network make it possible to simulate the actual functioning of a pool-based electricity market. The simulator is based on the widely used software package MATLAB, and a computer communication net, which can be replaced by the WWW.     

The Impact of Corporate Reputation on Firm Risk: A Panel Data Analysis of Spanish Quoted Firms

Researchers have traditionally addressed the influence of corporate reputation on firm performance, but have not considered the influence of corporate reputation on firm risk. This research develops hypotheses regarding the opposing influence of corporate reputation on a firm's systematic risk, unsystematic risk and total risk, as well as the moderation effect of firm size and industry concentration. Using a panel data method, these relationships are analysed, controlling for the effects of endogeneity, for a sample of Spanish quoted firms in the period 2001–2007. Specifically, two complementary analyses are performed. The first distinguishes firms included and not included in the MERCO index of the most reputable firms. The second analyses the impact of corporate reputation for the sub‐sample of most reputable firms. Being reputable reduces a firm's unsystematic risk and total risk, but increases systematic risk. In addition, firm size weakens these influences of corporate reputation on firm risk. However, among the most reputable firms, differences in reputation score have a lower effect on risk. Specifically, the corporate reputation level only influences firm unsystematic risk. It seems that what matters is not the degree of corporate reputation, but whether being or not being reputable is the question in terms of risk.     

Feeling Included and Valued: How Perceived Respect Affects Positive Team Identity and Willingness to Invest in the Team

Previous research has documented that intra‐group respect fosters individual engagement with work teams or organizations. The authors extend this work by empirically distinguishing between perceived inclusion of the self in the team and perceived value of the self for the team as separate psychological consequences of respect. Based on a social identity analysis, it is predicted that perceived inclusion facilitates the development of a positive team identity (how the individual feels about the team), while perceived value elicits the willingness to invest in the team (what the individual is willing to do for the team). Support for these predictions is obtained with structural equation modelling among two independent samples of professional soldiers working in military teams (n_total = 495). Reports of individual team members about positive team identity and willingness to invest in the team correlated with supervisor ratings of the team's action readiness.