Identifying Aberrant Data in Structural Equation Models With IRLS-ADF

In structural equation models, outliers could result in inaccurate parameter estimates and misleading fit statistics when using traditional methods. To robustly estimate structural equation models, iteratively reweighted least squares (IRLS; Yuan & Bentler, 2000) has been proposed, but not thoroughly examined. We explore the large-sample properties of IRLS and its effect on parameter recovery, model fit, and aberrant data identification. A parametric bootstrap technique is proposed to determine the tuning parameters of IRLS, which results in improved Type I error rates in aberrant data identification, for data sets generated from homogenous populations. Scenarios concerning (a) simulated data, (b) contaminated data, and (c) a real data set are studied. Results indicate good parameter recovery, model fit, and aberrant data identification when noisy observations are drawn from a real data set, but lackluster parameter recovery and identification of aberrant data when the noise is parametrically structured. Practical implications and further research are discussed.     

The Correspondence of Charles Darwin as a Tool for Reflecting on Nature of Science

Science & Education - This study took place in an introductory science inquiry course for preservice elementary school teachers as a supplement to lessons on critical thinking. The...     

Development as Discourse: What relevance to education?

Regarding 'development' as a constructed and contested concept can enable us working in international education to re-examine our assumptions and approaches as 'developers'. Given its theoretical origins in post-modern, post-colonial and feminist thought, the concept of development as discourse implies more than simply 'development speak' and can provide a way into analysing relationships around knowledge and power. Stressing that there are many overlapping discourses, rather than just one Development Discourse, I explore in this paper the insights gained, methods used and constraints faced when using this approach during fieldwork in Nepal. Practical situations like literacy classes or meetings, and texts such as funding proposals or students' writing, illustrate how analysis of development discourses can bring out new dimensions relevant to training and planning. Moving from this micro-level to a wider context, I argue that the ideological dimension of educational planning and policy needs to be recognized and analysed through a focus on discourse. Instead of suggesting that a certain policy succeeds or fails in 'technical' terms, policy makers can then begin to ask different questions which acknowledge the political agendas of the various development players and allow for a greater variety of voices to be heard.     

Self-Efficacy,Stress, and Academic Success in College

This paper investigates the joint effects of academic self-efficacy and stress on the academic performance of 107 nontraditional, largely immigrant and minority, college freshmen at a large urban commuter institution. We developed a survey instrument to measure the level of academic self-efficacy and perceived stress associated with 27 college-related tasks. Both scales have high reliability, and they are moderately negatively correlated. We estimated structural equation models to assess the relative importance of stress and self-efficacy in predicting three academic performance outcomes: first-year college GPA, the number of accumulated credits, and college retention after the first year. The results suggest that academic self-efficacy is a more robust and consistent predictor than stress of academic success.     

Regulative discourses of primary schooling in Greece: memories of punishment

The mechanisms of discipline and power within the institution of the school constitute, in part, the relationship between society and childhood. This article traces the relationship between official regulative discourses of control and punishment practices over students in primary school. It focuses on the memories of schooling of first-year students in a Department of Primary Education at a Greek University. The concepts of power, discipline and discourse from the theory of Michel Foucault are drawn on to examine the pedagogical control over primary school pupils. The research was carried out using an open questionnaire in which participants were asked to describe their experiences of school punishment. The key findings showed that corporal punishment is dominant in the memory of the majority of research participants. The reason for the pupils’ punishment was mainly their making noise in the classroom and their poor performance in core subjects of the curriculum. These findings are significant for the sociology of education as they reveal the real and symbolic violence of school life that endures in memories of childhood, schooling and society.     

Between ‘enrichment’ and ‘endangerment’: ‘cultural diversity’ and the politics of belonging in the Berlin school choice discourse

Even though choice is not officially a feature in the German primary school system, some parents intervene in determining which school their child attends. Especially in urban contexts, the informal school market is growing. This demand is based on promises with respect to a certain quality of education as well as on issues that prevail in certain inner city schools. In looking at Berlin, as a global city, this article shows how contrary school choice practices gain traction in the face of ‘cultural differences’ that those practices produce discursively. Cultural semantics are activated with regard to the composition of the student body, when parents chose schools with a bilingual profile, but also when parents engage in the practice of ‘group enrolment’ into schools in inner city hotspots perceived as problematic. Our research shows how school choice practices may become acceptable despite being a public taboo, if parents argue by appeal to ‘cultural differences’.     

Rationality, Information Search and Choice in Higher Education: Evidence from Greece

The paper presents the findings of a study of the decision-making process which precedes the choice of a university in Greece. Specifically, the degree of rationality exhibited by prospective students is assessed in an attempt to provide a test for the economic approach to the explanation of human behaviour. Information search is used as an indication of rationality and measured through a survey conducted among 220 university students in the academic year 2003/2004. The findings provide weak support for the rationality postulate in that they indicate that more than 40% of respondents could not be classified as information seekers. Logistic regression analysis was used in order to identify characteristics associated with the propensity to engage in information search: high socioeconomic status students, students who perceived the decision as important, and students who had acquired information prior to the choice of a university were found to be more likely to engage in information search. The paper draws attention to the limitations of the economic rational man model of human behaviour and discusses the implications of the findings for the promotional strategy of universities.     

Protégé Perceptions of High Mentorship Quality Depend on Shared Values More Than on Demographic Match

Mentoring, particularly same-gender and same-race mentoring, is increasingly seen as a powerful method to attract and retain more women and racial minorities into science, technology, engineering, and mathematics (STEM) education and careers. This study examines elements of a mentoring dyad relationship (i.e., demographic and perceived similarity of values) that influenced the perceived quality of mentorship, as well as the effect of mentorship on STEM career commitment. A national sample of African American undergraduates majoring in STEM disciplines were surveyed in their senior year. Overall, perceived similarity, rather than demographic similarity of values, was the most important factor associated with protégé perceptions of high-quality mentorship, which in turn was associated with higher commitment to STEM careers. We discuss the implications for mentoring underrepresented students and broadening participation in STEM.     

Science education through informal education

To develop the pedagogic efficiency of informal education in science teaching, promoting a close cooperation between institutions is suggested by Monteiro, Janerine, de Carvalho, and Martins. In their article, they point out effective examples of how teachers and educators work together to develop programs and activities at informal education places such as science museums. Their study explored and discussed the viability and relevancy of school visits to museums and possibilities to enhance the connection between students’ visits in informal contexts and their learning in schools. Given that students learn science by crossing the boundaries of formal and informal learning contexts, it is critical to examine ways of integrated and collaborative approach to develop scientific literacy to help students think, act and communicate as members of problem solving communities. In this forum, we suggest the importance of students’ lifeworld contexts in informal learning places as continuum of Monteiro, Janerine, de Carvalho, and Martins’ discussion on enhancing the effectiveness of informal learning places in science education.     

The Meaning of Social Inclusion for People with Disabilities in South Korea

This study sets out to examine and understand the meaning of social inclusion for people with disabilities, as constructed by people with disabilities themselves. Focus group interviews with 34 people who have physical impairments, cerebral palsy, or hearing or visual impairments were conducted for the study. Using the data obtained from these interviews, the interviewees’ various definitions and perceptions of social inclusion were analysed and four meaning categories for social inclusion were identified: excluded/segregated, present, participating, and actively participating. The findings of this research can be used as foundational material in the development of disability policies and the improvement of social services to better enable full social participation and social inclusion for people with disabilities.