Robust Bayesian bonus-malus premiums under the conditional specification model

The conditional specification technique introduced by Arnold et al. (Conditional specification of statistical models. Springer series in statistics. Springer, New York, 1999) was used in Sarabia et al. (Astin Bull 34(1):85–98, 2004) to obtain bonus-malus premiums. The Poisson distribution for which the parameter is a function of the classical structure parameter was used and a new class of prior distributions appeared in a natural way. This model contains, as a particular case, the classical compound Poisson model. In the present paper, the Bayesian robustness of this new model is examined and found to be much more robust than in the classical model in Gómez et al. (Insur Math Econ 31:105–113, 2002). For the present study, the moment conditions on the prior distribution are required. Examples, with real data, are given to illustrate our ideas under the net and exponential premium principles.     

Bayesian inference for the mean and standard deviation of a normal population when only the sample size,mean and range are observed

Consider a random sample X₁, X₂,…, X_n, from a normal population with unknown mean and standard deviation. Only the sample size, mean and range are recorded and it is necessary to estimate the unknown population mean and standard deviation. In this paper the estimation of the mean and standard deviation is made from a Bayesian perspective by using a Markov Chain Monte Carlo (MCMC) algorithm to simulate samples from the intractable joint posterior distribution of the mean and standard deviation. The proposed methodology is applied to simulated and real data. The real data refers to the sugar content (^oBRIX level) of orange juice produced in different countries.     

Untersuchung der autoritären Einstellung bei ungarischen StudentInnen

We asked daytime university and college students to complete the survey, which aimed at examining the authoritarian attitude of those questioned, and the factors in connection to it. The questionnaire was made up of 23 statements, and those questioned had to express how far they agree on a five grade scale (N = 349). On the basis of the answers it could be stated that the different groups of those planning to work in different fields differ from each other also from the point of view of accepting authority: from those groups which were examined in greater numbers the physical education teachers and the theologians were the most authoritarian, while the social workers and students of human studies were the least. Those answering differed also in terms of religiousness: those considering themselves religious and close to the church seemed to be the most authoritarian and those who are not religious the least. The results were interestingly coloured by the fact that in assessing specific social situations the social workers and the convinced non-religious ones showed signs of more authoritarian attitude. Results also proved that the own opinion about authoritarianism is related to the opinion of the parents. Beside many other questions we also examined whether authoritarianism is related to the situation when someone is stricter to him/herself and to those emotionally closer than to others.     

Interethnic dating preferences of Roma and non-Roma secondary school students

Integrated schooling is known to induce interethnic friendship relations; however, it also creates the opportunity of interethnic dating. Interethnic personal relationships or long-term exposure decreases ethnic prejudice, thus it is proposed that willingness to date between ethnic groups may also increase. The question arises, whether in the school context exposure is enough for this mechanism to emerge, or personal contact is necessary. It must also be taken into account that romantic relationships are embedded in status relations within schools. Based on a ‘social exchange’ mechanism, it is assumed that the less popular members of the majority groups are those who are more willing to form interethnic dating relations. To address the above questions empirically, the data of 1213 Hungarian 9th grade students in 43 classes were analysed. Preferences of Roma and non-Roma students were measured by dyadic attribution of physical attractiveness and nominations of willingness to date. Results of multilevel p2 models suggest that mixed groups are not sufficient, but personal contacts are necessary to decrease same-ethnicity preferences in dating. An additional tendency is salient: among majority students, those who are isolated from the friendship networks are the ones who are more willing to date members of the minority group.     

Employee and Volunteer

The purpose of this research is to analyze the different factors that determine the level of time devoted to volunteer activity involving employed people. To this end, we applied a logistic regression model to a sample of 5,067 employees, considering four categories of factors: family and personal, on the one hand, and contextual factors, on the other. This second group involves three factor categories: occupational, organizational, and community involvement factors. The findings of this work are especially relevant to two areas: first, to design a policy of corporate social responsibility that effectively integrates the figure of corporate volunteering, considering its pertinent factors; and second, to broaden the perspective of the third‐sector organizations beyond the traditional profile with which volunteers are commonly associated.     

The heritage machine: the neoliberal order and the individualisation of identity in Maragatería (Spain)

Since the inception of modernity, minority and majority identities have been constructed in a twofold process involving the parallel generation of representations of difference and the obliteration of alterity, that is, of other modes of existence. The exacerbation of the modern period in the supermodern era has furthered this process, adapting it to the new forms of neoliberal and post-political governmentality. This is paralleled by a shift from real to symbolic and metacultural forms of interaction that serve to negotiate identity and hegemony in the social sphere. Heritage has become a fundamental trope for the negotiation of identity, access to resources and power, as its production is not anymore bounded to the State but is rather ‘dispersed’ in society. This article explores the way cultural heritage has become a ‘machine’ for the production of dominant and individualised identities interacting in a deregulated market environment in Maragatería (Spain).     

Identifying students’ intercultural communicative competence at the beginning of their placement: towards the enhancement of study abroad programmes

A pre-placement questionnaire was completed by a cohort of 30 students participating in the Erasmus exchange programmes from the University of Salamanca, placed in British universities, and by a group of 25 Nottingham Trent University students hosted by diverse Spanish universities. The questionnaire was then analysed with the aim of providing a profile of their intercultural communicative competence (ICC), based on data about their self-perceived motivation and their intercultural awareness, knowledge, attitudes and skills, prior to their stay abroad. Despite the fact that their previous experience abroad, level of language proficiency and home university requirements for the placement differed, both groups shared a positive attitude towards the host country, considered themselves ready to adapt to new cultural environments, regarded misperceptions and solving conflicts as their greater challenge and expressed a willingness to grow personally and professionally. These data will inform a larger research project seeking to identify the factors that promote the acquisition of intercultural competences, as a basis for universities to equip students with tools aimed at overcoming obstacles that may pose an educational challenge for them and hinder the development of their ICC while on placement abroad.     

An Efficient and Egalitarian Negotiation Procedure for Economies with Externalities

We construct a simple mechanism that can be used in situations when a group of well informed agents try to cooperate in the production and allocation of a good with external effects. We start by auctioning the right to have the initiative in the negotiation, then the winner proposes an allocation that is implemented if the rest of the players unanimously accept it. In case of a rejection, the process is started again. We show that the outcome of any stationary subgame perfect Nash equilibrium leads to an efficient allocation of the good with externalities, together with an equal split of the surplus that cooperation generates.     

Are Spontaneous Expressions and Emotions Linked? an Experimental Test of Coherence

We measured facial behaviors shown by participants in a laboratory study in which a film was used to elicit intense emotions. Participants provided subjective reports of their emotions and their faces were recorded by a concealed camera. We did not find the coherence claimed by other authors (e.g., Rosenberg & Ekman, 1994) between the displayed facial expressions and subjective reports of emotion. We thus concluded that certain emotions are not a necessary or sufficient precondition of certain spontaneous expressions.