A study of the power associated with testing factor mean differences under violations of factorial invariance

We examine the power associated with the test of factor mean differences when the assumption of factorial invariance is violated. Utilizing the Wald test for obtaining power, issues of model size, sample size, and total versus partial noninvariance are considered along with variation of actual factor mean differences. Results of a population study show that power is profoundly affected by true factor mean differences but is relatively unaffected by the degree of factor loading noninvariance. Inequality of sample size has a profound effect on power probabilities with power decreasing as sample sizes become increasingly disparate. Sample size variations operate such that power is uniformly lower when the group with the smaller generalized variance is associated with the smaller sample size. An increase in the number of variables yields uniformly larger power probabilities. No substantial differences are found between total and partial noninvariance. Results are related to work in the area of robustness of Hotelling's T ² statistic and discussed in terms of asymptotic covariability of factor means and factor loadings. Implications for practice are considered.     

A self-phase modulated oscillator and some implications

A self-phase modulated sinewave oscillator is proved to perform as a periodic function generator. The system is investigated comprehensively and is shown to be capable of generating a variety of non-sinusoidal waveforms. The change from the generation of one waveform to the generation of another is attained by the variation of a relatively simple function in a skeletal model which does not change.     

Hispanic college students’ views of effective middle-school teachers: A multi-stage mixed analysis

In this multi-stage mixed-analysis study, the views of 437 Hispanic college students enrolled at two Hispanic-Serving Institutions in the Southwest of the USA were obtained concerning characteristics of effective middle-school teachers. Through the method of constant comparison (qualitative phase), 38 themes were determined to be present in respondents’ characteristics of effective middle-school teachers. Then, these themes (quantitative phase), quantified into an inter-respondent matrix that consisted of a series of 1s and 0s, were analysed to determine whether participants differed in their themes as a function of gender, college status and first-generation/non-first-generation status. Statistically significant differences were present between males and females, between undergraduate and graduate students, and between first-generation and non-first-generation college students in their emphases on effective middle-school teachers. Implications are discussed.     

The Physical Education Predisposition Scale: Preliminary development and validation

Abstract

The main aim of this study was to develop and test psychometrically the Physical Education Predisposition Scale, to assess secondary school students' cost–benefit assessment of physical education (PE) participation (PE attitude affective and attitude cognitive) and self-perceptions (PE perceived competence and self-efficacy). Secondary aims were to explore how the two variables were related, and to investigate age and gender differences. Altogether, 315 Year 8 and 9 students (aged 12–14 years) from four North West England schools completed the Physical Education Predisposition Scale. Principal components analysis revealed the presence of a simple two-factor solution explaining 60.7% of the variance. Factor 1 (labelled Perceived PE Worth) reflected attitude affective and attitude cognitive (α = 0.91), and factor 2 (Perceived PE Ability) represented perceived competence and self-efficacy (α = 0.89). Significant positive correlations were observed between the factors (r = 0.67 to 0.71, P < 0.001). Boys scored significantly higher than girls on Perceived PE Worth (P < 0.001) and Perceived PE Ability (P = 0.02). Similarly, Year 8 students scored significantly higher than Year 9 students on Perceived PE Worth (P = 0.005) and Perceived PE Ability (P < 0.001). Our results support the potential of the Physical Education Predisposition Scale as a concise measurement tool for use in the PE setting, for both teachers and researchers.     

Identity formation in educational settings: A contextualized view of theory and research in practice

In this concluding article of the special issue entitled “Identity Formation in Educational Settings”, we explicate the notion of identity as an integrative concept, discuss its growing popularity in the social sciences, and point to its special significance to education in contemporary society. Following an Eriksonian psychosocial approach and sociocultural emphasis, we look at the process of identity formation as a product of interrelatedness between the context and the individual person, and underscore the interaction between developmental and learning processes. We draw examples from the studies in this collection to highlight these conceptual relationships, as well as to contribute insights from the different research questions and modes of inquiry into the practice of co-construction of identity and knowledge in a variety of school contexts. We conclude with a call for the promotion of practice, research and theory in the emerging domain of identity formation in educational settings.     

A Library Perspective: Data Wranglers in LibraryLand: Finding Opportunities in the Changing Policy Landscape

T. Scott Plutchak, director of Digital Data Curation Strategies, gave a talk about managing data, managing expectations, and opportunities to manage your institution in the move to make research data accessible. An historic view of the Office of Science and Technology Policy, the funder’s mandates, and other policy formations set the stage for the discussion of the role of the library in this institutional challenge. In his new role at the University of Alabama at Birmingham, Plutchak operates at The Edge of Chaos, with “data wranglers”— concerned parties from a variety of disciplines who all have an interest in data management and who come together to share ideas and move closer to an innovative solution.     

The incidence of depressive symptomatology in juvenile sex offenders with a history of abuse

Depressive symptomatology was assessed in a sample of 246 male juvenile sex offenders using the Beck Depression Inventory. Of these participants, the racial composition was black = 147, Hispanic = 62, Caucasian = 34. Three adolescents elected not to identify their racial origin. Subjects were divided according to their self-reports of having been sexually or physically abused. The mean Beck score across all subjects was 14.3, a value markedly higher than published norms and indicative of mild depression. Forty-two percent of subjects attained scores indicative of appreciable depressive symptomatology. A history of sexual or physical abuse was significantly related to high Beck scores; abused subjects had a mean Beck score of 16.4, as contrasted to 12.3 for nonabused subjects (Wilcoxon test: z = 2.82; p less than .005). This relationship was apparent across all racial groups. While Hispanic subjects tended to have higher Beck scores and Caucasians lower scores, racial differences were not statistically significant. Results indicate that juveniles who have committed sexual crimes, particularly those with a history of abuse, should be evaluated for depression.     

A complex dynamic systems perspective on teacher learning and identity formation: an instrumental case

ABSTRACT

Scholars have called for new conceptualisations of teachers’ learning that capture the complex, contextualised, and dynamic nature of professional growth. In this article, we describe the Dynamic Systems Model of Role Identity (DSMRI) that portrays teacher learning as inseparable from the complex and dynamic processes by which teachers form their professional identities. The model depicts theoretical and procedural learning about teaching as integrated with other ontological and epistemological beliefs, self-perceptions and self-definitions, purpose and goals in teaching, and perceived action possibilities that constitute the teacher’s professional role identity. After describing the DSMRI, we demonstrate its application with an instrumental case of a science teacher who participated in a professional development (PD) institute designed to foster learning and motivation for implementing student-centred, inquiry-based instruction. DSMRI-guided analysis of pre-, mid-, and post-institute interviews highlighted the role of pre-PD role identities of learner and teacher in the teacher’s PD experiences, which, in turn, fostered both new alignments and new tensions in the teacher’s role identity that promoted an overall change towards a more student-centred teacher role identity. The article demonstrates the utility of the DSMRI for conceptualising teachers’ learning as contextualised and dynamic identity formation processes.