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Direct linkBaccini, Alberto; De Nicolao, Giuseppe – Research Evaluation, 2017
This letter documents some problems in Ancaiani et al. (2015). Namely the evaluation of concordance, based on Cohen's kappa, reported by Ancaiani et al. was not computed on the whole random sample of 9,199 articles, but on a subset of 7,597 articles. The kappas relative to the whole random sample were in the range 0.07-0.15, indicating an…
Descriptors: Foreign Countries, Scientific Research, Evaluation, Statistical Analysis
Porcu, Mariano; Giambona, Francesca – Journal of Early Adolescence, 2017
Latent class analysis (LCA) is a statistical method used to group individuals (cases, units) into classes (categories) of an unobserved (latent) variable on the basis of the responses made on a set of nominal, ordinal, or continuous observed variables. In this article, we introduce LCA in order to demonstrate its usefulness to early adolescence…
Descriptors: Statistical Analysis, Classification, Early Adolescents, National Surveys
Non-Hierarchical Clustering as a Method to Analyse an Open-Ended Questionnaire on Algebraic Thinking
Download full textDi Paola, Benedetto; Battaglia, Onofrio Rosario; Fazio, Claudio – South African Journal of Education, 2016
The problem of taking a data set and separating it into subgroups, where the members of each subgroup are more similar to each other than they are to members outside the subgroup, has been extensively studied in science and mathematics education research. Student responses to written questions and multiple-choice tests have been characterised and…
Descriptors: Foreign Countries, Grade 10, Questionnaires, Algebra
Castejón, Alba; Zancajo, Adrián – European Educational Research Journal, 2015
This article focuses on analysing the effect of educational differentiation policies of OECD educational systems on socioeconomically disadvantaged students, based on data from PISA 2009. The analysis is conducted on the basis of a definition of two subgroups of disadvantaged students: those that achieve high scores, and those obtaining scores…
Descriptors: Disadvantaged, Educational Policy, Educational Practices, Individualized Programs
Borella, Erika; Carretti, Barbara; Cantarella, Alessandra; Riboldi, Francesco; Zavagnin, Michela; De Beni, Rossana – Developmental Psychology, 2014
The purpose of the present study was to test the efficacy of a visuospatial working memory (WM) training in terms of its transfer effects and maintenance effects, in the young-old and old-old. Forty young-old and 40 old-old adults took part in the study. Twenty participants in each age group received training with a visuospatial WM task, whereas…
Descriptors: Visual Perception, Spatial Ability, Short Term Memory, Transfer of Training
