Mixture Simultaneous Factor Analysis for Capturing Differences in Latent Variables Between Higher Level Units of Multilevel Data

Given multivariate data, many research questions pertain to the covariance structure: whether and how the variables (e.g., personality measures) covary. Exploratory factor analysis (EFA) is often used to look for latent variables that might explain the covariances among variables; for example, the Big Five personality structure. In the case of multilevel data, one might wonder whether or not the same covariance (factor) structure holds for each so-called data block (containing data of 1 higher level unit). For instance, is the Big Five personality structure found in each country or do cross-cultural differences exist? The well-known multigroup EFA framework falls short in answering such questions, especially for numerous groups or blocks. We introduce mixture simultaneous factor analysis (MSFA), performing a mixture model clustering of data blocks, based on their factor structure. A simulation study shows excellent results with respect to parameter recovery and an empirical example is included to illustrate the value of MSFA.     

The Relationship between Metacognitive Ability and Metacognitive Accuracy

Metacognition and Learning - Judgments of learning (JOLs), as one type of metacognitive judgments, are assessments that people make about how well they have learned material. The effective use of...     

Endophytes from medicinal plants and their potential for producing indole acetic acid,improving seed germination and mitigating oxidative stress

Medicinal plants have been used by marginal communities to treat various ailments. However, the potential of endophytes within these bio-prospective medicinal plants remains unknown. The present study elucidates the endophytic diversity of medicinal plants (Caralluma acutangula, Rhazya stricta, and Moringa peregrina) and the endophyte role in seed growth and oxidative stress. Various organs of medicinal plants yielded ten endophytes, which were identified as Phoma sp. (6 isolates), Alternaria sp. (2), Bipolaris sp. (1), and Cladosporium sp. (1) based on 18S rDNA sequencing and phylogenetic analysis. The culture filtrates (CFs; 25%, 50%, and 100% concentrations) from these endophytes were tested against the growth of normal and dwarf mutant rice lines. Endophytic CF exhibited dose-dependent growth stimulation and suppression effects. CF (100%) of Phoma sp. significantly increased rice seed germination and growth compared to controls and other endophytes. This growth-promoting effect was due to the presence of indole acetic acid in endophytic CF. The gas chromatography/mass spectrometry (GC/MS) analysis showed the highest indole acetic acid content ((54.31±0.21) μmol/L) in Bipolaris sp. In addition, the isolate of Bipolaris sp. exhibited significantly higher radical scavenging and anti-lipid peroxidation activity than the other isolates. Bipolaris sp. and Phoma sp. also exhibited significantly higher flavonoid and phenolic contents. The medicinal plants exhibited the presence of bio-prospective endophytic strains, which could be used for the improvement of crop growth and the mitigation of oxidative stresses.     

Sociological theory and the analysis of strategies of educational redress

In this paper, three sociological models or theoretical templates for the analysis of social order are outlined: (a) the order-consensus model, (b) the conflict model and (c) interactionist models. The paper then discusses how each model can be applied to what is here called educational redress. Special reference is made to those redress strategies addressed to pre-school-age children-strategies customarily termed Compensatory Education Programmes. The paper goes on to show how proponents of each model would approach the analysis of such programmes, and how proponents of each model would criticize the other models' analyses. It is shown that the three sociological models are located in, and formalizations of, commonsense conceptions of social structure tacitly held by lay members of society, and that even professional educators typically do not make their model of society very explicit. Finally the paper upholds the belief that the above elements constitute what sociologists can add to the understanding of educational redress strategies.     

Changing the Subject: Retraining Teachers to Teach Science

This paper reports the experiences of teachers involved in a novel retraining scheme designed to meet a short-term crisis in numbers of teachers of physics. Teachers trained in other subject areas underwent an intensive six-month training in physics and were then placed in schools. During the first year of teaching some support for ongoing learning in science was provided. A study of these teachers' experiences found they lacked content knowledge in areas of the curriculum other than physics and were unprepared for the reality of the science classroom. Their existing classroom management skills were of only limited value in the new context. For those graduates who were supported by experienced staff in schools, the transition to science teaching was hard but ultimately worthwhile. For some, whose qualifications to teach science were never accepted by their peers, retraining was a bitter experience.     

Are young dual language learners homogeneous? Identifying subgroups using latent class analysis

Although dual language learners (DLLs) are linguistically, culturally, and socially diverse, researchers usually study them in aggregate and compare them to non-DLLs. The authors' purpose was to identify subgroups of preschool DLLs using latent class analysis. There were 7,361 DLLs and 69,457 non-DLLs. Results revealed three distinct classes. Children in class 1 (emergent bilingual children) tended to speak mostly their native language but some English at home and in the classroom. Children in class 2 (bilingual children) tended to speak English only in the classroom, but spoke both languages at home. Children in class 3 (heritage language speakers) tended to speak only their native language at home and in the classroom. Different demographic profiles and levels of development and learning were observed across classes. The DLL subgroups and their profiles provide important information about how educational programs may be tailored to meet the diverse needs of young DLLs.     

Portrait of the student as a young writer: some student survey findings about attitudes to writing and self‐efficacy as writers

This New Zealand‐based article reports on an analysis of data gathered over two years from upper primary school students on their attitudes to writing and writing instruction and their beliefs about their self‐efficacy as developing writers. Responses from 449 students in five diverse schools are included. Through an online survey administered at the beginning and end of each of the two years, students responded to a range of mostly closed questions. Conclusions (including student comments) were made about students' likes, dislikes and preferences as developing writers. Levels of association between their attitudes and gender and between their attitudes and proficiency levels were explored. Conclusions were also made about how student attitudes affect teacher practice.     

Sponsored Research Versus Graduating Students? Intervening Variables and Unanticipated Findings in Public Research Universities

This article examines the relationship between sponsored research monies and the graduation of undergraduate students at 22 public research universities. Using institutional and student characteristics for 59,982 students at these universities, we conducted chi-square, cross-tabulation, correlation, and hierarchical nonlinear modeling (HNLM) analyses to determine the relationship between our principal independent and dependent variables, and among them and other individual and institutional variables, including SAT (individual and institutional mean), gender (individual and percentage), underrepresented minority (individual and percentage), and graduate academic program rating. In contrast to a basic premise of most policymakers and academic managers, our findings suggest that an institution's sponsored research expenditures are positively related to undergraduates' graduation. We also find that mean SAT has a powerful impact on student graduation, although at the individual level gender is a more powerful correlate of graduation than is SAT score.     

A more equitable account of the note-taking functions in learning from lecture and from text

Previous research investigating the encoding, encoding-plus-storage, and extermal-storage functions of note taking has failed to equate processing opportunities among the groups. The present studies did so by having the encoding group take notes on two occasions without review, the encoding-plus-storage group take notes one time and review notes the next, and the external-storage group twice review a set of borrowed notes. Three forms of note taking were used: conventional, and note taking on skeletal and matrix frameworks. In both Experiment 1, involving lecture learning, and Experiment 2, involving text learning, an advantage was found for the encoding-plus-storage function on tests involving factual-recall and recognition performance but not on tests measuring higher-order performance. With respect to note-taking forms, no advantage existed for any form when information was acquired from lecture. When text material was used there was some advantage for conventional notes and a clear advantage for not taking notes at all, but instead twice reading the material. These findings were explained relative to observed note-taking behaviors, the opportunity for review, and the processing demands proposed by the combination of reading and note taking, particularly when notes must be classified into an existing framework.     

Enhancing non-technical skills by a multidisciplinary engineering summer school

In general engineering studies focus on the technical skills in their own discipline. However, in their subsequent industrial careers, a significant portion of their time needs to be devoted to non-technical skills. In addition, in an increasingly globalised world collaboration in teams across cultures and disciplines is paramount to the creation of new and innovative products. In order to enhance the non-technical skills for groups of engineering students a series of innovation courses has been arranged and delivered in close collaboration with an industrial company (Bang & Olufsen). These courses have been organised as summer schools called ‘Conceptual Design and Development of Innovative Products’ (CD-DIP) and delivered outside the usual educational environment. In order to explore the impact of this single course, we have conducted a study among the students participating from 2007 to 2013. This has been carried out both qualitatively using interviews with selected students as well as quantitatively using a survey. The results are outstanding in demonstrating that the non-technical skills obtained in this single course have been of high value for a large portion of the students' subsequent professional life.