A Note on the Use of Mixture Models for Individual Prediction

Mixture models capture heterogeneity in data by decomposing the population into latent subgroups, each of which is governed by its own subgroup-specific set of parameters. Despite the flexibility and widespread use of these models, most applications have focused solely on making inferences for whole or subpopulations, rather than individual cases. This article presents a general framework for computing marginal and conditional predicted values for individuals using mixture model results. These predicted values can be used to characterize covariate effects, examine the fit of the model for specific individuals, or forecast future observations from previous ones. Two empirical examples are provided to demonstrate the usefulness of individual predicted values in applications of mixture models. The first example examines the relative timing of initiation of substance use using a multiple event process survival mixture model, whereas the second example evaluates changes in depressive symptoms over adolescence using a growth mixture model.     

Communicating comparative findings from meta-analysis in educational research: some examples and suggestions

ABSTRACT

This article reviews some of the strengths and limitations of the comparative use of meta-analysis findings, using examples from the Sutton Trust-Education Endowment Foundation Teaching and Learning ‘Toolkit’ which summarizes a range of educational approaches to improve pupil attainment in schools. This comparative use of quantitative findings has similar characteristics to umbrella reviews which provide a succinct but applicable summary of the current state of evidence to inform practice or policy. Meta-analysis helps to identify which approaches have, on average, made the most difference to tested learning outcomes, in terms of effect size. We suggest that any comparative inferences made between meta-analyses should be treated cautiously, but taken seriously. Additionally, we present alternative ways of interpreting effect sizes, security ratings and cost-estimates to make research findings accessible, whilst retaining appropriate accuracy which is discussed using the ‘Toolkit’ as an example. We conclude by arguing that we should consider the available information not as ‘what works’, but ‘what has worked’ to understand its value and limits in terms of supporting the development of research-based practice.     

The paradox of un/making science people: practicing ethico-political hesitations in science education

Over the years neoliberal ideology and discourse have become intricately connected to making science people. Science educators work within a complicated paradox where they are obligated to meet neoliberal demands that reinscribe dominant, hegemonic assumptions for producing a scientific workforce. Whether it is the discourse of school science, processes of being a scientist, or definitions of science particular subjects are made intelligible as others are made unintelligible. This paper resides within the messy entanglements of feminist poststructural and new materialist perspectives to provoke spaces where science educators might enact ethicopolitical hesitations. By turning to and living in theory, the un/making of certain kinds of science people reveals material effects and affects. Practicing ethicopolitical hesitations prompt science educators to consider beginning their work from ontological assumptions that begin with abundance rather than lack.     

Bullies and victims in schools in central and southern Italy

Anonymous questionnaires assessing the amount and nature of bullying/victimization were given to 1379 primary and middle school pupils (8–11; 11–14yrs) in two towns of Central and Southern Italy, Florence and Cosenza. The questionnaire closely followed the design of Olweus (1991) and Whitney and Smith (1993). Results were analysed in terms of percentages of bullying others and being bullied, types of bullying behaviour, where it occurred and who were the perpretators. Bullying was reported in both Italian areas at a more substantial level than found in other countries, including Norway, England, Spain and Japan, although it presented similar structural features to those reported elsewhere: being bullied decreased in older pupils, bullying others was most likely to be admitted by boys, the perpetretators were in the same class as the victims. Considering direct and indirect forms of bullying, year and gender differences are discussed for the two Italian areas and in cross-national perspective.     

Longitudinal predictions between temperamental sensitivities and achievement goal orientations in the early school years

Students’ goal strivings are known to be connected with important outcomes, both academically and with regard to individual well-being. In spite of their importance, our knowledge of factors contributing to their early development is rather limited. In this longitudinal study on school beginners (N = 212), we focused on the interrelationships between achievement goal orientations (mastery; performance-approach; performance-avoidance; work-avoidance) and two temperamental sensitivities that appear relevant for the developing sense of mastery and performance in the school setting: interindividual reward sensitivity (reward derived from social approval and attention) and sensitivity to punishment (propensity to perceive cues of potential threat in the environment, and react with withdrawal and avoidance). The data were collected over the first three school years, from grade 1 (7–8 years) to grade 3 (9–10 years), and analysed using PLS-SEM. As expected, both temperamental sensitivities and achievement goal orientations remained relatively stable over time. Interindividual reward sensitivity was related negatively with mastery and positively with performance-approach and performance-avoidance orientations, from the first through to the third year. Punishment sensitivity had a positive effect on performance-avoidance orientation, and indirect, reciprocal, negative effects with performance-approach orientation. The findings provide new knowledge on early relationships between temperament and goal strivings. Interindividual reward sensitivity appears consistently associated with performance concerns and decreased mastery strivings. Such connections may have long-standing negative influence on students’ educational trajectories, and point to the importance of acknowledging individual differences in temperament and their role in motivation and learning.

     

Higher Education Leadership and Management: From Conflict to Interdependence through Strategic Planning

Institutional leadership and management are two entirely different, yet intimately intertwined, aspects of the overall effective functioning of a higher education institution (HEI). This paper is intended to (1) define and differentiate between the two concepts, (2) critically discuss their importance and vital interdependence, (3) discuss circumstances that can create conflict or compatibility between these concepts, (4) critically examine models of strategic planning and suggest a better approach to this process, and (5) offer suggestions for the improvement of both leadership and management in the context of co-existence within a redefined strategic planning environment.     

Enhancing visuospatial skills in second graders: An exploratory follow‐up study

This study was intended to assess the effect of a psychoeducational computer‐assisted and paper‐and‐pencil training designed to empower visuospatial skills in students attending the second grade of the primary school. At pretest, posttest and at the subsequent 3‐months follow‐up, 44 Italian second graders were presented with a battery of tests assessing nonverbal problem solving, imagery, speed of processing, visuomotor coordination, and verbal working memory. After pretest, 22 pupils were trained by the psychoeducational intervention for 15 weekly sessions (Fastame & Antonini (2011). RECUPERO IN… abilità visuo‐spaziali [Recovery in… visuo‐spatial abilities]. Trento, Italy: Edizioni Erickson). Posttest scores and a follow‐up assessment conducted after 3 months by the end of the training documented the positive effect of the psychoeducational intervention in enhancing visuospatial functions of the experimental group. These outcomes were also replicated when a questionnaire assessing visuospatial efficacy was proposed to the teachers of the participants.     

Remedial interventions for children with reading disabilities: speech perception--an effective component in phonological training?

The effects of two types of phonological training in children with reading disabilities (RD) were examined. One of the programs (SP/LPA) trained children in speech discrimination, letter-sound correspondence, and phonemic awareness. The other program (LPA) trained children only in letter-sound correspondence and phonemic awareness. The effects of these programs were compared with a control group. Thirty-five children with RD were trained in small groups five times a week for 4 weeks. The results indicated that both experimental groups improved in phonemic awareness compared to the control group but that only the SP/LPA group scored higher than the control group in reading.