The Diffusion of Innovations: A Methodological Reappraisal

Studies of diffusion have traditionally relied on specific distributions, primarily the logistic, to characterize and estimate those processes. We argue that such an approach gives rise to serious problems of comparability and interpretation and may result in large biases in the estimates of the parameters of interest. We propose instead the Gini's expected mean difference as a measure of diffusion speed. We discuss its advantages over the traditional approach, present a nonparametric estimation procedure, and tackle with it the problems of truncated processes and of intergroup comparisons. We also elaborate on the use of the hazard rate and suggest various extensions. The diffusion of computed tomography scanners is presented as an illustration.     

On the potential in the estimation of linear functions in regression

New aspects of potential in Cook's Influence measure for linear combinations are explored. It is shown that this potential can be considered as a case influence measure in the scatter of estimated combinations. The potential is related to precise estimation directions and multicollinearity concepts; It Is also used as a basis for selection of new cases.     

A coordinate-free approach to testable hypotheses

Using the coordinate-free version of the linear model and geometrical considerations, the usual definition of testable hyptheses is extended. The concept of partially testable hypotheses is defined in that context. This new approach provides an alternative to the one given by Peixoto (1986), offering some complementary aspects. Simple and direct techniques for testing the new testable hyptheses by means of the classical testing procedure are given.     

Problematizing the “informal sector”: 50 years of critique,clarification, qualification,and more critique

Since its coining in 1971, the concept of the “informal sector” has been used to draw scholarly, political, and philanthropic attention to hundreds of millions of workers who lack basic labor protections. But as the term proliferated, so too did its detractors. Critics claim that the label of “informal” homogenizes the world's poor and distorts understandings of the sources of and solutions to their economic woes. What are the origins of the concept's contradictory nature? What strategies have scholars used to increase the likelihood that it will be used to illuminate and uplift, rather than to distort and denigrate? This article analyzes how scholars have resignified and retheorized the informal economy in response to five conceptual challenges: stigmatization, definitional fuzziness, homogenization, an either/or fallacy, and the presumption of “formalization” as the solution. Such efforts have preserved the concept's analytic potency and political relevance. In the longer term, however, a true testament to the concept's value would be if it outlives its own utility; that is, if it mobilizes enough recognition and resources to the invisibilized majority of the world's workers that scholars and state bureaucrats no longer feel the need to lump them together under a misleading catchall label.     

Locking down adolescents: Victims,irresponsible subjects,or just social actors

The article presents the results of a qualitative study investigating the experiences of a sample of Italian adolescents during the COVID-19 pandemic. Data were analysed in the light of the two social representations (adolescents as criminals and as victims) that permeated the Italian public debate throughout the outbreak. The findings showed the ability of boys and girls in dealing with the relationships altered by the pandemic constraints and in adapting to different regulations. This demonstrated their competence as social actors, neither criminals nor victims, who were also able to cope with the coronavirus risk in safeguarding their significant others.     

Is this the end of globalization (as we know it)?

ABSTRACT

According to different media and analysts, globalization could be in a phase of ‘slowbalization’, de-globalization or even secular stagnation. After surveying academic proposals for defining, classifying and measuring globalization, by means of the Elcano Global Presence Index, this paper explores to what extent globalization has stagnated and/or whether it has changed its nature. Our results show that globalization has slowed down, but not retrenched. However, economic globalization has lost traction (something that probably explains the general perception on de-globalization) while soft projection has become the main driver of globalization.     

Web 2.0 support for individual,group and organizational learning

This article explores how Web 2.0 interactive technologies are valuable for generative, learner-driven, instructor-facilitated virtual learning processes integrated with work tasks for solving problems and coping with challenges. This is in contrast to the earlier generation of one-way technologies that is traditionally used for adaptive, instructor-driven online learning programs for skills and knowledge training, and communicating corporate policies and procedures. Learning professionals need to be open to encourage employees' experimentation with new software tools and techniques, value technology gatekeepers in their organization and promote informal learning.     

Congruency of the Cognitive and Affective Components of the Attitude as a Moderator on Intention of Condom Use Predictors

Using data gathered through questionnaires on factors relating to the intention of condom use included in the Theory of Planned Behavior, we obtained evidence in favor of the two-dimensional structure of attitude: affective and cognitive components. In a structural equation model for predicting the intention of condom use as an instrumental behavior, we found that the congruence between the affective and cognitive components moderates the influence of attitude, subjective norm and perceived behavioral control in the intention of condom use. Since most of the studies do not take into account this proposed interaction, they can only report a kind of main effects average. Moreover, the percentage of explained variance of intention is higher for those individuals with the same value for the two components (congruent group). Furthermore, we found that perceived behavioral control is the most determining factor and that the cognitive component of the attitude is a better predictor than the affective one. The results are discussed from the point of view of their implications for designing prevention programmes for sexually transmitted diseases.     

Is the trend to publish reviews and clinical trials related to the journal impact factor? Analysis in dentistry field

ABSTRACT

It is generally accepted that the Journal Impact Factor is a quality criterion. The objective was to determine the evolution along the period 2010–2016 of number of different types of papers, reviews and clinical trials, published by dental journals, as well as if they are related with the quartile occupied in the Journal Impact Factor 2017 ranking. To this end, ten journals per quartile belonging to the field Dentistry, Oral Surgery and Medicine in the 2017 Journal Citation Reports were randomly selected. For each journal and year, the total number of narrative reviews, systematic reviews (with and without meta-analysis), meta-analysis, clinical trials and randomized controlled trials were obtained from Pubmed. To achieve our goal, the slope of these variables over time was estimated using the least squares method, after which one-way analysis of variance of mean values was performed. In Dentistry, the journals of the top quartiles show a trend to publish increasing amounts of systematic reviews and meta-analysis, than the ones of the third and fourth quartile. On the other hand, globally, there was virtually no increase in narrative reviews, clinical trials and randomized controlled trial. Possible causes of this behavior are also discussed in this article.