Abstention as an escape from Arrow's theorem

There are non-dictatorial social welfare functions satisfying the Pareto principle and Arrow's independence of irrelevant alternatives when voters can abstain. In particular, with just seven voters, the number of dictatorial social welfare functions satisfying Arrow's conditions could be deemed, relative to the total number of social welfare functions satisfying Arrow's conditions, negligible.     

The Different Faces of Islamic Terrorism

Islamic fundamentalist terrorism is not a monolithic phenomenon, as its protagonists have been multiple and varied actors. In spite of its diversity, the roots of this phenomenon can be found in a series of psychosocial factors, in the historical background itself of the Arab-Muslim countries, in the political, social and economic structure of these societies, and, finally, in the dominant ideological and religious superstructure in these cultures. It is necessary to analyze this entire series of variables, then, in order to interpret the role and the effectiveness of Islamic fundamentalist terrorism in the world today.     

Occupational Segregation and the Female–Male Wage Differentials: Evidence for Spain

Using matched employer–employee data from the Spanish labour market in 2010, we analyse the effects of industrial, establishment and occupational segregation on the gender wage differential, disaggregating the latter contribution by different groups of workers belonging to different occupational areas and responsibility levels. These workers are employed in 61 occupations within 26,492 establishments in 51 different industries. Since the matched employer–employee data exhibit a particular type of grouped structure, which contrasts the statistical properties of such data with the random sample case, we estimate the effects of each type of gender segregation on the wage gap using a robust specification. We find that the major part of the contribution of gender segregation is not explained by differences in the observable characteristics. Furthermore, the estimations show that the educational female advantage has helped to narrow the gender wage gap caused by occupational segregation within each establishment only for those groups of workers with the lowest educational requirements.     

Broadening the Land Question in Food Sovereignty to Northern Settings: A Case Study of Occupy the Farm

Abstract

Land access is an accepted corollary to food sovereignty, long promoted by the transnational agrarian movement La Via Campesina (LVC). LVC's land access politics have evolved with increased incorporation of diverse perspectives, but remain largely focused on achieving ‘integral agrarian reform’ in the global South. Here, I take a case where food sovereignty activists (‘Occupy the Farm’ (OTF)) occupied land owned by a public university in California, the USA, in order to broaden food sovereignty's land access considerations beyond the South, and to analyze conditions where political actions (including occupations) can help achieve changes in land access regimes. The OTF action was successful in challenging cultural norms about property and achieving access, partly due to the occupation having foregrounded multiple appealing narratives that invited participation and wider support. These narratives included agroecology versus biotechnologies; community/public access versus privatization; participatory versus bureaucratic governance structure; and green space/food production versus urban development. The article tests the use of the ‘land sovereignty’ frame in expanding food sovereignty's land politics, to encompass land contestation contexts globally and deal with the particular conditions surrounding lands. The case indicates that land occupations in the North are potentially useful—but uncertain, and very context-dependent—tactics to promote land and food sovereignty.     

Motivational factors and physician advice for physical activity in older urban adults

This study aimed to ascertain by means of a new scale older adults' motives for engaging in physical activity, in a probability and representative sample of an older urban population. The sample size was 630 older adults, ranging from 65 to 94 years in age, randomly selected using multistage sampling. The participants completed a 17-item questionnaire, as well as answering questions on demographic variables, type of demand for physical activity, and physician's recommendation. A principal-component analysis was performed. The relationships among the four factors (physical health, social relationships, competence, and physician's advice) show a clearly motivational structure. Significant relationships have also been found between physician's recommendation and type of demand. The findings suggest that programs promoting physical activity in older adults should have different characteristics from those aimed at general adult populations.     

Influence diagnostics on the coefficient of variation of elliptically contoured distributions

In this article, we study the behavior of the coefficient of variation (CV) of a random variable that follows a symmetric distribution in the real line. Specifically, we estimate this coefficient using the maximum-likelihood (ML) method. In addition, we provide asymptotic inference for this parameter, which allows us to contrast hypothesis and construct confidence intervals. Furthermore, we produce influence diagnostics to evaluate the sensitivity of the ML estimate of this coefficient when atypical data are present. Moreover, we illustrate the obtained results by using financial real data. Finally, we carry out a simulation study to detect the potential influence of atypical observations on the ML estimator of the CV of a symmetric distribution. The illustration and simulation demonstrate the robustness of the ML estimation of this coefficient.     

Dominance intensity measure within fuzzy weight oriented MAUT: An application

We introduce a dominance intensity measuring method to derive a ranking of alternatives to deal with incomplete information in multi-criteria decision-making problems on the basis of multi-attribute utility theory (MAUT) and fuzzy sets theory. We consider the situation where there is imprecision concerning decision-makers' preferences, and imprecise weights are represented by trapezoidal fuzzy weights. The proposed method is based on the dominance values between pairs of alternatives. These values can be computed by linear programming, as an additive multi-attribute utility model is used to rate the alternatives. Dominance values are then transformed into dominance intensity measures, used to rank the alternatives under consideration. Distances between fuzzy numbers based on the generalization of the left and right fuzzy numbers are utilized to account for fuzzy weights.     

A class of copulas with piecewise linear horizontal sections

We introduce the class of bivariate copulas with piecewise linear horizontal sections whose graph is composed, at most, of two segments. It is a wide class of copulas which contains some known copulas. We study several properties of the copulas in the new class concerning absolute continuity, singular components, measures of association, concordance ordering, dependence concepts and symmetry. Finally, we provide several examples.