Beta Regression for Modelling Rates and Proportions

This paper proposes a regression model where the response is beta distributed using a parameterization of the beta law that is indexed by mean and dispersion parameters. The proposed model is useful for situations where the variable of interest is continuous and restricted to the interval (0, 1) and is related to other variables through a regression structure. The regression parameters of the beta regression model are interpretable in terms of the mean of the response and, when the logit link is used, of an odds ratio, unlike the parameters of a linear regression that employs a transformed response. Estimation is performed by maximum likelihood. We provide closed-form expressions for the score function, for Fisher's information matrix and its inverse. Hypothesis testing is performed using approximations obtained from the asymptotic normality of the maximum likelihood estimator. Some diagnostic measures are introduced. Finally, practical applications that employ real data are presented and discussed.     

Immigrant Incorporation and Sociocultural Transnationalism1

This article analyzes sociocultural transnational linkages among Colombian, Dominican, and Salvadoran immigrants in the United States. It emphasizes the importance of comparative analysis and yields three main findings. First, participation in any particular transnational activity is low, but participation over all the different forms of transnational practices is extended. Second, the process of incorporation does not weaken transnational participation. Third, there is more than one causal path that can account for the rise of transnational sociocultural practices. The different paths can be explained by reference to the context of reception and the mode of incorporation of each group.     

Images of Contract: An Empirical Study of the Use of Theory in Practice

Correspondence to Dr Silvia Fargion, Social Work Unit, Faculty of Sociology, University of Trento, Via Verdi 26, 38100 Trento, Italy. E-mail: silvia.fargion{at}soc.unitn.it Summary Based on a project on the use of contract work by practitionersin Family Support Services in Italy, this article addressesthe relation between theory and practice from a language perspective.Practitioners' representations illustrate two main ways of interpretingthe concept of contract, one focusing on the agreement betweenclient and practitioners, the other on a structured way of working.These two images of contract appear connected to different ‘languagegames’, that is frameworks practitioners use to make senseof their work. This finding casts doubts on the very possibilityof conjugating, in concrete practice, empowering approacheswith a highly structured way of working, as the contract methodand other approaches in social work attempt to do. The researchalso shows how theoretical concepts can be reinterpreted andused in different ways by practitioners, consistent with thebroader languages that social workers adopt to communicate about,and make sense of, their work.     

Impact Evaluation of a Cognitive Behavioral Group Therapy Model in Brazilian Sexually Abused Girls

This study evaluated the impact of a cognitive behavioral group therapy model in Brazilian girls who had experienced sexual abuse. The effect of the waiting period before treatment and the enduring effectiveness of the treatment after six and 12 months were also evaluated. Forty-nine female sexual abuse victims between the ages of 9 and 16 completed instruments measuring depression, anxiety, stress, and post-traumatic stress disorder before, during, and after the group therapy. The group therapy had a positive impact on their psychological functioning, significantly reducing symptoms of anxiety, stress, and post-traumatic stress disorder. The therapeutic effects lasted six to 12 months after the treatment ended. The model proved effective for treating young female victims of sexual abuse.     

Developing Entrepreneurship in Social Work Through International Education. Reflections on a European Intensive Programme

This paper addresses the issue of introducing training on entrepreneurial skills in social work education and illustrates the opportunities offered for doing so by international courses. It presents a critical reflection on the concept of entrepreneurship in social work based on the case of a European Intensive Programme within the Erasmus scheme. It explores the potential of using active experiential learning methods in an international environment and of creating a situation where participants are confronted with ‘real world’ problems so that they can develop entrepreneurial skills. The paper argues that experiences of this kind provide new stimuli and contribute substantially to developing an entrepreneurial mentality, by which is meant innovative and proactive attitudes as well as skills to develop the resources with which to face social problems in an adverse context.     

A Class of Multidimensional Latent Class IRT Models for Ordinal Polytomous Item Responses

We propose a class of multidimensional Item Response Theory models for polytomously-scored items with ordinal response categories. This class extends an existing class of multidimensional models for dichotomously-scored items in which the latent abilities are represented by a random vector assumed to have a discrete distribution, with support points corresponding to different latent classes in the population. In the proposed approach, we allow for different parameterizations for the conditional distribution of the response variables given the latent traits, which depend on the type of link function and the constraints imposed on the item parameters. Moreover, we suggest a strategy for model selection that is based on a series of steps consisting of selecting specific features, such as the dimension of the model (number of latent traits), the number of latent classes, and the specific parameterization. In order to illustrate the proposed approach, we analyze a dataset from a study on anxiety and depression on a sample of oncological patients.     

Some simulations and applications of forecasting long-memory time-series models

In this paper, we show some results of forecasting based on the ARFIMA(p,d,q) and ARIMA(p,d,q) models. We show, by simulation, that the technique of forecasting of the ARIMA(p,d,q) model can also be used when d is fractional, i.e., for the ARFIMA(p,d,q) model. We also conduct a simulation study to compare the two estimators of d obtained through regression methods. They are used in the hypothesis test to decide whether or not the series has long memory property and are compared on the basis of their k-step ahead forecast errors. The properties of long-memory models are also investigated using an actual set of data.     

Explaining Gender Inequalities That Follow Couple Migration

By exploiting the unique social and economic differences between East and West Germany, the authors investigated how macro‐level opportunities interact with couple‐level decision making to explain gender differences in the determinants and economic outcomes of household migration. By incorporating regional socioeconomic conditions into household bargaining theory, 4 hypotheses for each region were derived. The hypotheses were tested using cross‐classified multilevel regressions and the German Socio‐Economic Panel (1992–2012) combined with regional economic indicators. First, gender‐specific determinants of couples' West–West (i.e., within West Germany) and East‐to‐West migration were analyzed; second, subsequent economic consequences were investigated by comparing couples with singles. The results confirm that gender differences in macro‐conditions can impose decision logics that seemingly contradict the initial power relation within couples. Despite more traditional gender arrangements in West Germany, well‐educated partnered women earn significant absolute and relative income gains from migration; their egalitarian East German counterparts suffer significant losses compared with single women and East German men.     

Dropout of Hospital Volunteers in Italy

Voluntary work in Charities is a constantly growing reality: in particular, in the last few years, voluntary work in hospitals has become of great importance, marking a substantial increase of commitment in social issues. However, at the same time, volunteering Charities have been plagued by the increase of the phenomenon of dropout, that is, volunteers abandoning the Charitable Association they’re working in, often after a relatively short period of activity. In this study, we attempted to verify if and how active and dropped out volunteers perceive their own activity as a source of anxiety and stress. Our data show that both active and dropped out volunteers show high levels of burnout; in fact, dropped out volunteers show higher levels of burnout, especially of emotional exhaustion, in comparison with active volunteers. Subsequently, we identified the factors potentially assuming the role of mediators or moderators in the direct relation involving the status of voluntary work activity and the levels of anxiety and burnout. Our study demonstrates that coping strategies and the relationship established with hospital workers can be considered good moderators.