Multigroup Confirmatory Factor Analysis: Locating the Invariant Referent Sets

Multigroup confirmatory factor analysis (MCFA) is a popular method for the examination of measurement invariance and specifically, factor invariance. Recent research has begun to focus on using MCFA to detect invariance for test items. MCFA requires certain parameters (e.g., factor loadings) to be constrained for model identification, which are assumed to be invariant across groups, and act as referent variables. When this invariance assumption is violated, location of the parameters that actually differ across groups becomes difficult. The factor ratio test and the stepwise partitioning procedure in combination have been suggested as methods to locate invariant referents, and appear to perform favorably with real data examples. However, the procedures have not been evaluated through simulations where the extent and magnitude of a lack of invariance is known. This simulation study examines these methods in terms of accuracy (i.e., true positive and false positive rates) of identifying invariant referent variables.     

Typing Performance and Technique of Higher Education Students with Specific Learning Disorders

Higher education students with specific learning disorders (SLD) often experience difficulties in basic learning skills, including typing on computers, which has become the most common writing mode for academic purposes. This may affect their academic performance. We compared the typing performance, product, and technique (screen gaze, finger use) of 35 SLD and 30 typically developing (TD) students using keylogging software. Compared to TD peers, students with SLD typed more slowly and less accurately, and gazed less at the screen, suggesting a less effective typing technique. They typed slower even after controlling for screen gaze, implying that additional factors may account for their lower typing speed such as language processing. Hence, students with SLD may benefit from typing instruction alongside test accommodations during computer-based exams.     

UTILITY OF THE STANFORD–BINET INTELLIGENCE SCALES,FIFTH EDITION,WITH ETHNICALLY DIVERSE PRESCHOOLERS

Current research on the use of revisions of intelligence measures with ethnically diverse populations and younger children is limited. The present study investigated the utility of the Stanford–Binet Intelligence Scales, Fifth Edition (SB5), with an ethnically diverse preschool sample. African American and Caucasian preschoolers, matched on age, gender, and parental education, were found to have similar patterns of high and low scores on both the composites and all subtests of the SB5. The present study also found that African American and Caucasian preschool children did not differ on overall cognitive ability as measured by the SB5 Full Scale IQ. Implications and suggestions for further research are discussed.     

Biomechanical analysis of the change in pistol shooting format in modern pentathlon

Abstract

Despite the importance of the Combined Event to the modern pentathlon competition, little is known about performance in the event. This study aimed to (i) identify the key variables affecting Combined Event shooting performance, and the extent to which these corresponded with those identified for precision shooting and (ii) investigate the impact of changing shooting format, and whether more successful precision shooters were also more successful in the Combined Event. Seven modern pentathletes and three pistol shooters completed precision and Combined Event trials. An opto-electronic shooting system recorded score and pistol movements, whilst force platforms recorded centre of pressure movements 1 s prior to every shot. Intra-individual analysis revealed that the extent of associations between variables was participant-specific, highlighting the need for individual analysis of performance. No participants displayed matching associations between variables for precision and Combined Event shooting, emphasising the difference between performances in the two events. Both groups experienced significantly reduced scores, and increased pistol and body movements for Combined Event shooting (P < 0.05). Despite the pistol shooters’ greater precision shooting ability, no significant differences were evident between the groups’ Combined Event performances (P > 0.05). This implies that experience in one event does not guarantee success in the other, indicating the importance of event specific training.     

ONE TEACHER, TWO LESSONS: THE LESSON STUDY PROCESS

In this paper, we analyze 2 lessons by 1 teacher that took place during a lesson study (LS) cycle for a team of elementary mathematics teachers. We analyze the data on 2 levels: macro-level analysis, dealing with lesson structure and setting; and micro-level analysis, zooming in on mathematical tasks and the quality of whole-class discussion. We analyze teacher participation in LS to identify the main mechanisms leading to changes in teaching observed between the 2 lessons. We argue that collaborative noticing, collaborative awareness, and brainstorming are the core mechanisms of teacher change in the course of LS.     

Adult word recognition and visual sequential memory

Two experiments were conducted investigating the role of visual sequential memory skill in the word recognition efficiency of undergraduate university students. Word recognition was assessed in a lexical decision task using regularly and strangely spelt words, and nonwords that were either standard orthographically legal strings or items made from words with internal transposed letters. Symbol memory was evaluated in a recognition procedure in which sequences of three to five unfamiliar complex symbols were presented, each followed by a subsequent array containing the symbols either in the same order or with an order transposition. In Experiment 1, there was no independent contribution of symbol memory to either word or nonword processing independently of the ability to discriminate the symbols from one another. In Experiment 2, although symbol memory made a significant contribution to word recognition independently of symbol discrimination and letter identification for two conditions??long strangely spelt words and short transposed-letter items, the effects were extremely small. It was concluded that non-verbal visual sequential memory skill does not play a central role in underpinning efficiency of word recognition in experienced adult readers.     

Performance of the Grade of Membership Model Under a Variety of Sample Sizes,Group Size Ratios,and Differential Group Response Probabilities for Dichotomous Indicators

Social scientists are frequently interested in identifying latent subgroups within the population, based on a set of observed variables. One of the more common tools for this purpose is latent class analysis (LCA), which models a scenario involving k finite and mutually exclusive classes within the population. An alternative approach to this problem is presented by the grade of membership (GoM) model, in which individuals are assumed to have partial membership in multiple population subgroups. In this respect, it differs from the hard groupings associated with LCA. The current Monte Carlo simulation study extended on prior work on the GoM by investigating its ability to recover underlying subgroups in the population for a variety of sample sizes, latent group size ratios, and differing group response profiles. In addition, this study compared the performance of GoM with that of LCA. Results demonstrated that when the underlying process conforms to the GoM model form, the GoM approach yielded more accurate classification results than did LCA. In addition, it was found that the GoM modeling paradigm yielded accurate results for samples as small as 200, even when latent subgroups were very unequal in size. Implications for practice were discussed.     

Implementing a national policy initiative to support education for sustainable development: lessons from Taiwan’s Environmental Education Act

Educational Research for Policy and Practice - This policy ethnography focuses on a nationwide environmental and sustainability education policy that was developed and enacted in response to United...     

Social Competence of Learning Disabled Children: Cognitive and Emotional Aspects

The aim of the study was to investigate the structure of social competence among learning disabled children, as reported by themselves and their teachers, and the cognitive and emotional aspects that mediate its level. The sample consisted of 40 learning disabled children and 37 matched nondisabled children. Within Harter's competence model and Schaefer's spherical model, the learning disabled group demonstrated lower levels of competence and adjustment and a less mature concept of competence than did their peers. The social competence of the learning disabled children was accounted for by emotional and physical aspects of competence, similar to that found in younger and in children with an intellectual disability, whereas the social competence of the nondisabled peers was accounted for by a combination of academic, cognitive and self‐esteem aspects. Teachers rated the social competence of both groups of children as mediated by introversion and general competence. However, teachers added physical competence to the explanation of the learning disabled group's social competence, whereas they added task orientation to the explanation for the nondisabled group. Intervention planning should be geared toward increasing the social competence of LD children, through alerting teachers to their less mature self‐competence concept, with its special emphasis on nonacademic aspects.