Powerful nonparametric statistics to compare k independent ROC curves

The authors deal with the problem of comparing receiver operating characteristic (ROC) curves from independent samples. From a nonparametric approach, they propose and study three different statistics. Their asymptotic distributions are obtained and a resample plan is considered. In order to study the statistical power of the introduced statistics, a simulation study is carried out. The (observed) results suggest that, for the considered models, the new statistics are more powerful than the usually employed ones (the Venkatraman test and the usual area under the ROC curve criterion) in non-uniform dominance situations and quite good otherwise.     

La formation en cours d'emploi en Europe: déterminants et effets sur les salaires

Partant des données du Panel communautaire de ménages (PCM) pour la période 1995–2001 dans six pays, les auteurs étudient les déterminants des activités de formation et les effets de celle‐ci sur les salaires. A partir de quatre indicateurs caractérisant la formation, ils montrent que, si les estimations par la méthode des moindres carrés ordinaires indiquent que, presque partout, la formation valorise substantiellement les salaires, les estimations avec effets fixes font apparaǐtre une incidence quasi nulle. Les effets sur les salaires seraient donc surestimés faute de prise en compte adéquate de la corrélation entre la formation et d'autres facteurs affectant les salaires.     

Three dimensions of effective mission implementation

Mission statements are generally considered an important tool for strategy implementation. However, several authors have shown that there is a ‘hole’ in the mission theory, which in practice explains the inconsistency in mission statements in many companies because of the lack of motivation related to the mission. This article aims to bridge this gap by analysing the relationship between the mission of a company and its members' motivation. It entails an extension of the mission theory, in which three dimensions of mission development are analysed: formal, dynamic and motivational. On the basis of this framework, three forms of mission consistency are considered to explain the effectiveness of mission implementation: authenticity, coherence and integrity.     

Colonization,coloniality and bio-power: biopolitics in Queensland,Australia

This essay illustrates how a Foucauldian theory of power could re-examine postcolonial, coloniality or colonization contexts, as opposed to the current structuralist and hierarchal theories of understanding power that colonization studies, such as coloniality/modernity or postcolonial studies, use to theorize colonization and race. I argue that a structuralist and hierarchal conceptualization of power relations in understanding colonization and its relationship with racism can be problematic, and that the Foucauldian heterarchical (non-hierarchal) understanding of power relations instead draws a more complete picture of the operation of colonization. In order to demonstrate this claim, I firstly briefly explain how colonization has been mainly theorized through postcolonial and coloniality studies. Then I introduce the relevance of Michel Foucault’s work in the problem of colonization, focusing on his theories of racism and the idea of biopolitics. Then I illustrate how a heterarchical theory of biopolitical power was used against Indigenous Australians in Queensland via the implementation of the Queensland Aboriginals Protection and Restriction of the Sale of Opium Act of 1897. Lastly, I offer some preliminary notes for conceptualizing the global assemblage of the ‘State of Exception’ in the context of colonial Queensland, Australia.     

Violent behaviour,victimization, self-esteem and physical activity of Spanish adolescents according to place of residence: a structural equation model / Conducta violenta,victimización,autoestima y actividad física de adolescentes españoles en función del lugar de residencia: un modelo de ecuaciones estructurales

This study aims to establish and verify an explanatory model for aggressive behaviour, self-esteem, victimization and physical activity in adolescents, and to use this explanatory model to analyse the association of place of residence with these variables. This research analysed 2,273 adolescents from the province of Granada (Spain) using the questionnaires Violent Behaviour at Schools, School Victimization Scale and Global Self-Esteem Scale. An analysis was carried out using structural equations. Results showed that relational and overt aggressiveness are related to self-esteem, victimization and physical activity. Furthermore, relational aggressiveness showed a stronger association with victimization and low self-esteem in adolescents who live in residential care. In addition, overt aggressiveness showed a stronger association with self-esteem in adolescents who live in family homes. Thus, exclusion and social rejection among peers have a greater impact on the victimization of young people who live outside of the family context.     

The Impacts of Cash Transfers on Subjective Wellbeing and Poverty: The Case of Colombia

Cash transfer programs have been the main social policy in the fight against poverty and inequality in Latin-American countries. This paper analyzes the impacts of the program Más Familias en Acción on the perception of poverty and subjective wellbeing in Colombia. The analyses are based on data from the Encuesta Nacional de Calidad de Vida between 2008 and 2016. Two empirical strategies were compared to account for the lack of randomness in groups of beneficiary and non-beneficiary families: (i) non-experimental designs (linear and nonlinear models with cross-sectional and pooled data); (ii) quasi-experimental designs (Propensity Score Matching and Inverse Probability Weighted Regression Adjustment). The results were robust to the different empirical strategies and emphasized that: (i) transfers increase the perception of food insecurity and subjective poverty; (ii) conditionalities involve positive impacts on different indicators of subjective wellbeing, especially health and education; (iii) general impacts on the perceptions of life are nonsignificant, as a result of divergent impacts on the dimensions of the subjective wellbeing of families.     

Challenging the neoliberal view of education: the Center for Ecoliteracy as a transformative educational practice

The neoliberal rationality of recent decades has, as one of its maxims, that of extending market logic to the rest of social dimensions on the basis of competition. However, the spreading of this neoliberal ‘drug’ requires profound political reforms. It calls for a cultural engineering of the public sector which has been fostered by the New Public Management (NPM). This form of governmentality controls current power relations and gives a new meaning to the management of public services, including the educational sector. In this paper, we maintain that there are ‘spaces of resistance’ against the neoliberal educational rationality. We analyse the Center for Ecoliteracy (CFE) as a transformative experience which integrates a holistic perspective into educational practice. We compare the principles of the NPM with those of the CFE, showing that there are more humanistic approaches to education which aim to teach students the need to live in sustainable communities.     

Intercultural educational alternatives based on sustainability from Mexico: beyond school and cultural belonging

Abstract

This article proposes the articulation of intercultural education and sustainability, linking the recognition of cultural diversity to socio-environmental concerns. This implies transcending formal education and classrooms; moving towards educational modalities that could impact people of different ages, and levels of scholastic achievement, with different needs and demands. We suggest that education is a key to transform structural conditions that have perpetuated inequality, and then to the self-empowerment of indigenous peoples, but that previous models, political basis and forms have not been pertinent, nor do they respond entirely to explicit demands of indigenous peoples. Intercultural education should go beyond simply adding cultural elements to the curriculum. Learning and sharing about ways to connect knowledges and know-how from cultural, social, economic and political distant sources, and ways to visualise and propose autochthonous relevant methods to transform their regions and make these visions of social justice real, are amongst the elements that we consider central to intercultural education. In order to demonstrate this, we analyse an experience of non-formal, collaborative, intercultural education with fisherwomen and youths, making up a learning community and emphasising a dialogue of knowledge for the conservation of their territory.     

A weighted bootstrap approximation for comparing the error distributions in nonparametric regression

Several procedures have been proposed for testing the equality of error distributions in two or more nonparametric regression models. Here we deal with methods based on comparing estimators of the cumulative distribution function (CDF) of the errors in each population to an estimator of the common CDF under the null hypothesis. The null distribution of the associated test statistics has been approximated by means of a smooth bootstrap (SB) estimator. This paper proposes to approximate their null distribution through a weighted bootstrap. It is shown that it produces a consistent estimator. The finite sample performance of this approximation is assessed by means of a simulation study, where it is also compared to the SB. This study reveals that, from a computational point of view, the proposed approximation is more efficient than the one provided by the SB.     

Analysis of a marker for cancer of the thyroid with a limit of detection

Limit of detection (LoD) is a common problem in the analysis of data generated by instruments that cannot detect very small concentrations or other quantities, resulting in left-censored measurements. Methods intended for data that are not subject to this problem are often difficult to modify for censoring. We adapt the simulation-extrapolation method, devised originally for fitting models with measurement error, to dealing with LoD in conjunction with a mixture analysis. The application relates the levels of thyroglobulin in individuals with cancer of the thyroid before and after treatment with radioactive iodine I–131. We conclude that the fitted mixture components correspond to levels of effectiveness of the treatment.