On sufficient conditions for the strong consistency of least-squares estimates

The strong consistency of the least-squares estimates in regression models is obtained when the errors are i.i.d. with absolute moment of order r, 0<r? 2. The assumptions presented for the random error sequence will permit us to obtain improvements of the conditions on the regressors in order to obtain the strong consistency of the least-squares estimates in linear and nonlinear regression models.     

Strong consistency of least squares estimates with i.i.d. errors with mean values not necessarily defined

We establish strong consistency of the least squares estimates in multiple regression models discarding the usual assumption of the errors having null mean value. Thus, we required them to be i.i.d. with absolute moment of order r, 0<r<2, and null mean value when r>1. Only moderately restrictive conditions are imposed on the model matrix. In our treatment, we use an extension of the Marcinkiewicz–Zygmund strong law to overcome the errors mean value not being defined. In this way, we get a unified treatment for the case of i.i.d. errors extending the results of some previous papers.     

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.     

ASTRONOMICS IN ACTION: THE GRADUATE EARNINGS PREMIUM AND THE DRAGON EFFECT IN SINGAPORE

This paper investigates the return to university education in Singapore using a new estimation strategy related to Chinese traditions where children born in the Year of the Dragon are believed to be superior. Because parents might time the arrival of their offspring on a Dragon year, this causes the Dragon cohort to be larger and university entry to be more competitive. First, we find evidence of a negative “Dragon effect” on university educational attainment. Then, using it as an estimation strategy, we find that university education has a ceteris paribus effect of raising earnings by at least 50% on average. (JEL I21, C26, J30)     

New two-stage sampling designs based on neoteric ranked set sampling

Neoteric ranked set sampling (NRSS) is a recently developed sampling plan, derived from the well-known ranked set sampling (RSS) scheme. It has already been proved that NRSS provides more efficient estimators for population mean and variance compared to RSS and other sampling designs based on ranked sets. In this work, we propose and evaluate the performance of some two-stage sampling designs based on NRSS. Five different sampling schemes are proposed. Through an extensive Monte Carlo simulation study, we verified that all proposed sampling designs outperform RSS, NRSS, and the original double RSS design, producing estimators for the population mean with a lower mean square error. Furthermore, as with NRSS, two-stage NRSS estimators present some bias for asymmetric distributions. We complement the study with a discussion on the relative performance of the proposed estimators. Moreover, an additional simulation based on data of the diameter and height of pine trees is presented.     

Peer relationships during late childhood in internationally adopted and institutionalized children

The aim of this study was to analyse the interpersonal relationships in the school context of children living in different care settings (adoptive families, residential care centres, birth families). Participants were 76 children between eight and fourteen years of age (M = 10.78, SD = 1.38), belonging to one of three groups: international adoptees, children living in residential care in Spanish institutions, and a comparison sample of Spanish children living with their birth families with no connection with child protection. Sociometric information was collected in the classroom of each child during school hours. Internationally adopted children from Russia showed considerable difficulties in their relationships with peers; they were more likely to be rejected and their peers described them as less prosocial and somewhat more aggressive. With a better sociometric position than the adoptees, children in residential care were rated by their peers as more aggressive and less prosocial than the normative population. Coordination and integrated work between the family, protection centres, schools, and other social services should be a strategic priority in the promotion of healthy social development in these groups of children.     

Measuring and Analysing Community Action for Health: An Indicator-Based Typology and Its Application to the Case of Barcelona

Social welfare systems face major challenges, particularly in a context of social transformation, austerity and growing inequalities. This process is highly visible in the health sector. In this context, many voices ask for public sector reforms and community action for health as a relevant practice. However, analyses and evaluations of this kind of practices are still limited, particularly beyond the cases of single community health actions or interventions. We still need to identify key indicators for measuring and characterising what community action for health consists of, as well as to what degree this kind of intervention has been developed across a city. Based on a research about 49 neighborhoods in Barcelona, this paper creates an index to measure and characterize community action for health, using different indicators: citizen engagement programs in community health, organizational transformation of the health and social protection systems, stable participatory structures with specific teams, and urban health policies. We apply the index to the case of Barcelona and build a map of community action for health in the city using 4 categories: strong community health development (one neighbourhood), middle (9 neighborhoods), emergent (25 neighborhoods) and without specific community health promotion (14 neighbourhoods). We find that community action for health is extensive within the city of Barcelona, have great potential as a response to the need for change in the relationship between the public (health) sector and the citizenry, but is still implemented unequally across the urban territory in terms of types and methods.     

Definitions of Need: Can disabled people and care professionals agree?

This paper attempts to examine the ideological frames of reference that inform the definitions of need that are used by disabled and non-disabled people. The main aim of the research upon which this paper is based being to test the degree of congruence of the non-disableds view of need with that of disabled people. Central to this is an exploration of the differences that exist in the perception of disability held by disabled people and nondisabled people. It investigates this through the use of a staged vignette based around a fictitious character (Mr Arthur Angus) and his family. The paper seeks to explore the multidimensional contexts in which individuals operate based upon a deconstruction of the medical/social locus of control model.     

Of Journal Editors and Editorial Boards: Who Are the Trailblazers in Increasing Editorial Board Gender Equality?

Female academics continue to be under‐represented on the editorial boards of many, but not all, management journals. This variability is intriguing, because it is reasonable to assume that the size of the pool of female faculty available and willing to serve on editorial boards is similar for all management journals. This paper therefore focuses on the characteristics of the journal editors to explain this variability; journal editors or editors‐in‐chief are the most influential people in the selection of editorial board members. The authors draw on social identity and homosocial reproduction theories, and on the gender and careers literature to examine the relationship between an editor's academic performance, professional age and gender, and editorial board gender equality. Longitudinal data are collected at five points in time, using five‐year intervals, from 52 management journals. To account for the nested structure of the data, a three‐level multilevel model was estimated. Overall, it is found that the prospects of board membership improve for women when editors are high‐performing, professionally young or female. The authors discuss these findings and their implications for management journals with low, stagnant or declining representation of women in their boards.     

Personal development plans supporting employee learning and perceived performance: the moderating role of self-directedness

Due to developments in the current dynamic business environment which is more global and competitive than ever, employees’ lifelong learning and the way organizations support their continuous development are pivotal. Many organizations introduce personal development plans (PDPs) to support employees’ learning, however, not always taking into account their personal characteristics. This study had a twofold purpose as it was designed to explore on the one hand the relationship between PDPs in the workplace with employee’s undertaking of learning activities and perceived performance, and on the other hand the possible moderating role of employee self-directedness on this relationship. For this study, data collected by means of a questionnaire at two different organizations were used, one organization foregoing profit and one non-profit activity. The results indicated significant positive relations between the individual supporting factor ‘employee learning and reflection’ and the undertaking of learning activities and perceived performance and between employee self-directedness and the undertaking of learning activities and perceived performance. The same accounted for the moderating effect of employee self-directedness on the interaction between learning and reflection and perceived performance. Some findings were surprising, nevertheless resulted in valuable insights and implications for practice.