Hypothesis test for paired samples in the presence of missing data

Missing data are present in almost all statistical analysis. In simple paired design tests, when some subject has one of the involved variables missing in the so-called partially overlapping samples scheme, it is usually discarded for the analysis. The lack of consistency between the information reported in the univariate and multivariate analysis is, perhaps, the main consequence. Although the randomness on the missing mechanism (missingness completely at random) is an usual and needed assumption for this particular situation, missing data presence could lead to serious inconsistencies on the reported conclusions. In this paper, the authors develop a simple and direct procedure which allows using the whole available information in order to perform paired tests. In particular, the proposed methodology is applied to check the equality among the means from two paired samples. In addition, the use of two different resampling techniques is also explored. Finally, real-world data are analysed.     

Extending dual multiple factor analysis to categorical tables

This paper describes a proposal for the extension of the dual multiple factor analysis (DMFA) method developed by Lê and Pagès 15 to the analysis of categorical tables in which the same set of variables is measured on different sets of individuals. The extension of DMFA is based on the transformation of categorical variables into properly weighted indicator variables, in a way analogous to that used in the multiple factor analysis of categorical variables. The DMFA of categorical variables enables visual comparison of the association structures between categories over the sample as a whole and in the various subsamples (sets of individuals). For each category, DMFA allows us to obtain its global (considering all the individuals) and partial (considering each set of individuals) coordinates in a factor space. This visual analysis allows us to compare the set of individuals to identify their similarities and differences. The suitability of the technique is illustrated through two applications: one using simulated data for two groups of individuals with very different association structures and the other using real data from a voting intention survey in which some respondents were interviewed by telephone and others face to face. The results indicate that the two data collection methods, while similar, are not entirely equivalent.     

Brazil’s non-indifference: a case for a feminist diplomatic agenda or geopolitics as usual?

At the beginning of the twenty-first century, Brazil took advantage of its economically and politically privileged position to challenge global normative structures. In 2004, the concept of “non-indifference” was integrated into the Brazilian vocabulary of foreign policy, justifying and legitimating the country’s acceptance of the invitation to command the United Nations Stabilization Mission in Haiti (MINUSTAH). On the one hand, non-indifference can be read as a discursive maneuver that enabled Brazil to accommodate its non-interventionist agenda to an old geopolitical game, given the pressure imposed upon “global players” to respond effectively and assertively to threats to international peace and security. On the other hand, the “Brazilian way” could also be seen as an alternative to a highly masculinized geopolitical approach to international security. This paper explores possible limitations, tensions and/or opportunities that emerge from the encounter between a feminist diplomatic agenda and a masculinizing ordering of the international space. It does so by contrasting Brazil’s ambition for a permanent seat on the United Nations Security Council (UNSC), the club of powerful states, with Brazil’s diplomatic and military performance during MINUSTAH, widely evaluated as a success due to characteristics such as solidarity, generosity, flexibility and the “warm conviviality” of Brazilian culture.     

Landscape Context Influences the Abundance and Richness of Native Lady Beetles Occupying Urban Vacant Land

Urban Ecosystems - Urban insect communities are structured by hierarchical filters including regional processes, human facilitation, and species interactions. We sought to inform future urban...     

The Child Abuse Risk Evaluation Dutch Version (CARE-NL): A retrospective validation study

Abstract

The Child Abuse Risk Evaluation – Dutch version (CARE-NL) is a structured professional guideline for assessing the risk of all types of child abuse. The CARE-NL comprises 18 risk factors: eight Parental characteristics, three Parent-Child interaction factors, five Family factors, one Child vulnerability factor, and an extra factor for child sexual abuse risk. We examined interrater reliability and predictive accuracy of the instrument in a retrospective study at Advice and Reporting Centers on Child Abuse (ARCCA) in The Netherlands. The ARCCA files contained limited information on Parental risk factors, while parental characteristics, such as mental disorder and substance abuse, are the most important risk factors for (repeated) child abuse. On the other hand, the majority of the files included ample information on child and family characteristics. The CARE-NL could be reliably coded by trained raters and the predictive accuracy for out-of-home placement (AUC = .73) and placement of the child under court supervision (AUC = .78), at two years follow-up, was adequate. Use of the CARE-NL ensures that the assessment of the risk of child abuse focuses on the most important, empirically based risk factors in a structured and coherent way.     

Buying Citizenship? Chinese Golden Visa Migrants in Portugal

In 2011, Portugal launched a residence permit programme to attract foreign investment from non-EU citizens, with Chinese business migrants representing those taking most advantage of this initiative. This paper analyses this policy measure and assesses its social consequences, as a new way that Chinese migrants have to enter Portugal. Firstly, we characterise this programme by identifying its principles and legal requirements, using official data from 2012 to 2018. We then describe the emergence of this type of residence permit as a response to the financial crisis of 2011, and as part of a neoliberal political rationality that has guided a governance model since this time. Next, we characterise the profile of Chinese citizens who benefit from this initiative and claim residence permits on the basis of their economic power. Finally, we discuss the social and political implications of this kind of entrance to Portugal, to provide some insights for policymakers.     

Size does matter: Passive sampling in urban parks of a regional bat assemblage

Urban Ecosystems - We studied the occurrence of bats in urban parks in the city of Madrid (Spain), and the resulting patterns were compared with bat occurrence in the surrounding region. In this...