Correlation between variables subject to an order restriction,with application to scientometric indices     

Miguel A. García-Pérez  Vicente Núñez-Antón 《Journal of Informetrics》2013,7(2):542-554

Variables subject to an order restriction, for instance Y ≤ X, have a bivariate distribution over a non-rectangular joint domain that entails a non-null and potentially large structural relation even if the variables show no association (in the sense that particular ranges of values of X do not co-occur with particular ranges of values of Y). Order restrictions affect a number of scientometric indices (including the h index and its variants) that are routinely subjected to correlational analyses to assess whether they provide redundant information, but these correlations are contaminated by the structural relation. This paper proposes an alternative definition of association between variables subject to an order restriction that eliminates their structural relation and reverts to the conventional definition when applied to variables that are not subject to order restrictions. This alternative definition is illustrated in a number of theoretical cases and it is also applied to empirical data involving scientometric indices subject to an order restriction. A test statistic is also derived which allows testing for the significance of an association between variables subject to an order restriction.  相似文献   

Sincretismo y pensamiento categorial: génesis y diferencias socioculturales     

Jesús Palacios  Juan Daniel Ramírez 《Infancia y Aprendizaje》2013,36(11):54-66

Resumen

El estudio de la representación del mundo en el niño es una de las vías que permiten acercarse a la génesis del pensamiento infantil, a su progresiva estructuración. Interesados en la evolución del sincretismo y del pensamiento categorial, los diálogos con los niños en torno a las ultra-cosas nos han permitido detectar distintos niveles evolutivos dentro del pensamiento sincrétn o y del categorial y nos han puesto en la pista de posibles diferencias socioculturales ligadas con la pertenencia al medio rural o urbano.  相似文献   

Comprensión de la inclusion jerárquica de clases Estudio evolutivo     

Jesús Alonso  Francisco Gutiérrez 《Infancia y Aprendizaje》2013,36(35-36):69-95

Resumen

En el presente trabajo se estudia el desarrollo de la comprensión de los principios que rigen la inclusión jerárquica de clases en sujetos de 4 a 14 años. Se presentan y comparan los resultados de tres experimentos en los que se utilizan, respectivamente, cuestiones de tipo piagetiano, problemas deductivos y problemas de inclusión con los cuantificadores «todos» y «algunos». Se examina también el efecto que diferentes variables definitorias de la estructura de las tareas tienen en el éxito o el fracaso en las mismas. Los resultados sugieren un desarrollo lineal progresivo en relación con la comprensión de la extensión diferente de clase y subclase, y la aplicación correcta de los cuantificadores, y un salto entre los 9 y 12 años en relación con la comprensión de la transitividad. Se discuten las implicaciones teóricas y prácticas de estos resultados.  相似文献   

Las ideas de los padres sobre sus hijos en la investigación evolutiva     

Jesús Palacios 《Infancia y Aprendizaje》2013,36(39-40):97-111

Resumen

Este artículo presenta una revisión de literatura sobre el tema de las ideas de los padres sobre el desarrollo y la educación de sus hijos. Se analizan los antecedentes históricos y posteriormente se discuten la diversidad, los contenidos y los determinantes de las ideas evolutivo-educativas de los padres. Después de una referencia a las relaciones ideas-conducta-desarrollo, se propone para este ámbito de investigación un marco teórico elaborado a partir de las propuestas de Vygotski.  相似文献   

Grade level, study time, and grade retention and their effects on motivation, self-regulated learning strategies, and mathematics achievement: a structural equation model     

Pedro Rosário  José Carlos Núñez  António Valle  Julio González-Pienda  Abílio Lourenço 《European Journal of Psychology of Education - EJPE》2013,28(4):1311-1331

The present study complements previous research findings with new data to improve our understanding of the relationship between motivational variables and academic performance in math mediated by self-regulated learning (SRL). A structural equation model with predictor (i.e., grade retention, grade level, and study time), process (i.e., perceived usefulness of SRL strategies, self-efficacy for the use of SRL strategies, and reported use of SRL), and product variables (i.e., academic achievement in mathematics) is proposed. The model was analyzed in two samples of data (calibration and validation samples). The first sample served to fit and respecify the model, and the second one was used to analyze the consistency of the findings of the first sample. A sample of 756 middle school Portuguese students participated in the current study. The results indicate that SRL is positively and significantly related to academic achievement and that the latter is, in turn, powerfully determined by perceived usefulness and self-efficacy, although students’ reported use of SRL strategies decreases from 7th to 9th grades. Self-efficacy and perceived usefulness of SRL strategies were also found to decrease as grade retention increased. These results are discussed with regard to the relevance of self-efficacy and perceived usefulness of SRL strategies in increasing academic achievement.  相似文献   

The role of Internet use and parental mediation on cyberbullying victimization among Spanish children from rural public schools     

Raúl Navarro  Cristina Serna  Verónica Martínez  Roberto Ruiz-Oliva 《European Journal of Psychology of Education - EJPE》2013,28(3):725-745

Cyberbullying victimization research on individual and familial correlates is scarce in Spain. By building upon previous studies, this research examines the role of Internet usage and parental mediation in online victimization. Spanish children from rural public schools (10–12 years; n?=?1068) completed a self-report questionnaire which measured being cyberbullied, Internet use and parental mediation strategies. Logistic regression analyses examined the association among cyberbullying victimization, online activities, intensity and purposes of online communication, and restricting, evaluating and co-using parental mediation. The results show that Internet use, specifically online communication, increases the likelihood of cyberbullying victimization. Conversely, monitoring software installed on the computer, joint creation of rules regarding the time spent online and personal information shared help lessen the likelihood of online victimization. The results are examined in the light of previous research, while implications for practice and future research are considered.  相似文献   

Why Teachers Should Know Spanish     

Dr. Maria Luisa Alvarez Harvey 《Clearing house (Menasha, Wis.)》2013,86(7):333-336

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Múineadh an dara Teanga: Athbhreithniú     

Seán M. Mac Dáibhéid  Seán P.O Conchúir 《Irish Educational Studies》2013,32(1):87-102

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Education, culture and indigenous rights: The case of educational feform in Bolivia     

Sonia Comboni Salinas  José Manuel Juárez Núñez 《Prospects》2000,30(1):105-124

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Cardiorespiratory and perceptual responses of two interval training and a continuous training protocol in healthy young men     

João Pedro Araújo Naves  Ana Cristina Silva Rebelo  Lucas Raphael Bento E Silva  Maria Sebastiana Silva  Rodrigo Ramirez-Campillo  Robinson Ramírez-Vélez 《European Journal of Sport Science》2019,19(5):653-660

High Intensity Interval Training (HIIT) can be performed with different effort to rest time-configurations, and this can largely influence training responses. The purpose of the study was to compare the acute physiological responses of two HIIT and one moderate intensity continuous training (MICT) protocol in young men. A randomised cross-over study with 10 men [age, 28.3?±?5.5years; weight, 77.3?±?9.3?kg; height, 1.8?±?0.1?m; peak oxygen consumption (VO₂peak), 44?±?11?mL.kg^?1.min^?1]. Participants performed a cardiorespiratory test on a treadmill to assess VO₂peak, velocity associated with VO₂peak (vVO₂peak), peak heart rate (HRpeak) and perceived exertion (RPE). Then participants performed three protocols equated by distance: Short HIIT (29 bouts of 30s at vVO₂peak, interspersed by 30s of passive recovery, 29?min in total), Long HIIT (3 bouts of 4?min at 90% of vVO₂peak, interspersed by 3?min of recovery at 60% of vVO₂peak, 21?min in total) and MICT (21?min at 70% of vVO₂peak). The protocols were performed in a randomised order with ≥48 h between them. VO₂, HRpeak and RPE were compared. VO₂peak in Long HIIT was significantly higher than Short HIIT and MICT (43?±?11 vs 32?±?8 and 37?±?8?mL.kg^?1.min^?1, respectively, P?P?P?2, HR and RPE than Short HIIT and MICT, suggesting a higher demand on the cardiorespiratory system. Short HIIT and MICT presented similar physiologic and perceptual responses, despite Short HIIT being performed at higher velocities.  相似文献