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.     

Validating the Portuguese Version of the Satisfaction With Life Scale in an Elderly Sample

Life satisfaction is referred to a cognitive, judgmental process (Diener et al. in J Pers Assess 49:71–75, 1985), in which person’s quality of life is globally assessed according to his/her chosen criteria (Shin and Johnson in Soc Indic res 5:475–492, 1978). Thus, life satisfaction is a conscious cognitive judgment, based on the comparison of one’s life with a self-imposed standard or set of standards, which lead to a global assessment of life (Pavot and Diener in Psychol Assess 5:164–172, 1993). Among the many scales developed to measure life satisfaction, the Satisfaction With Life Scale (SWLS, Diener et al. in J Pers Assess 49:71–75, 1985) is one of the global life satisfaction scales more often used in the research arena. It is composed of five items assessing global life satisfaction, using a Likert type response format. The aim of this paper is to validate the Portuguese version of the SWLS via confirmatory factor analysis, with a sample of 1,003 elderly from Angola. Reliability, factorial and criterial validity estimates are presented. Overall, the results shown that the scale had an adequate one-factor confirmatory solution, satisfying reliability indices, and adequate criterion-related validity when assessed in a sample of Angolan elderly. The discussion relates the results with existing literature and posits the contributions of the paper: firstly, it offers the researchers on life satisfaction in Portuguese-speaking contexts a brief, self-rated measure of satisfaction with life that has sound psychometric properties, validity, and reliability; secondly, it is the first confirmatory validation of the scale in Portuguese.     

Book reviews

Academics and others have long made use of survey items framed in a Likert form. This type of question, where respondents are asked to agree or disagree with a series of statements, has long been a staple of those creating attitude scales. There has, however, been increasing use of these items in inappropriate settings. This article discusses the appropriate and inappropriate use of Likert items in social science research, using three settings where the agree-disagree response settings are wrongly applied. It concludes with speculation about the diffusion of this form throughout the research culture.     

Pleasure Principles: Reflections on Saketopoulou’s “To Suffer Pleasure”

In this essay I elaborate some of the seminal ideas in Saketopoulou’s article ‘To Suffer Pleasure,” contrast them to Foucault’s notion of technologies of the self, and consider the uses of psychic work and physical pleasure. I highlight the importance Saketopoulou makes of a corporeal solution to intergenerational conflicts and consider ego shattering as a site of encounter: with the limits of signification in the body and its emergence at the edge of the social.     

Comentarios a «accióninvestigación y problemas de las minorias»

Resumen

Hemos realizado un estudio diferencial sobre las interpretaciones causales y sus consecuencias cognitivo- afectivas en un contexto de robo, utilizando como marco teórico el último modelo atribucional de Weiner (1986). Para ello, hemos aplicado cuestionarios de autoinforme a 1.450 sujetos menores de edad. Los resultados, obtenidos mediante análisis de la varianza y técnicas de regresión, indican (1) que existe una taxonomía de las causas claramente diferenciada en función de las dimensiones—locus, estabilidad y controlabilidad—, y de la perspectiva—actor/observador—de los sujetos; (2) que la estabilidad de las causas determina la predicción de reincidencia, y que ésta es mayor en los sujetos que dicen haber cometido más robos, y (3) que el sentimiento de culpa está determinado por la controlabilidad de las causas y varía como función inversa de la experiencia delictiva. Finalmente, señalamos algunas implicaciones teóricas y aplicadas de este trabajo.     

Costs of Extending the Noncontributory Pension Program for Elderly: The Mexican Case

Population aging coupled with high poverty rates among older persons and a lack of access to social-security benefits or traditional support systems have led governments in low and middle-income countries to introduce non-contributory pension programs for the elderly. This article reviews a non-contributory pension program introduced in Mexico in 2007 that has since expanded greatly. We use a variety of sources to estimate current and future costs of this program.     

Does the presence of independent and female directors impact firm performance? A multi-country study of board diversity

This study empirically analyzes whether gender diversity enhances boards of directors’ independence and efficiency. Using data from 3,876 public firms in 47 countries and controlling for a wide set of corporate governance mechanisms, we find that firms with more female directors have higher firm performance by market (Tobin’s Q) and accounting (return on assets) measures. The results also suggest that external independent directors do not contribute to firm performance unless the board is gender diversified. These results hold with respect to different estimation models and robustness tests. Overall, our findings provide evidence that the female directors enhance boards of directors’ effectiveness. Finally, we find that firms that are concerned with board independence, and that firms in more complex environments are more likely to have gender-balanced boards.