Power in Bayesian Mediation Analysis for Small Sample Research

Bayesian methods have the potential for increasing power in mediation analysis (Koopman, Howe, Hollenbeck, & Sin, 2015; Yuan & MacKinnon, 2009). This article compares the power of Bayesian credibility intervals for the mediated effect to the power of normal theory, distribution of the product, percentile, and bias-corrected bootstrap confidence intervals at N ≤ 200. Bayesian methods with diffuse priors have power comparable to the distribution of the product and bootstrap methods, and Bayesian methods with informative priors had the most power. Varying degrees of precision of prior distributions were also examined. Increased precision led to greater power only when N ≥ 100 and the effects were small, N < 60 and the effects were large, and N < 200 and the effects were medium. An empirical example from psychology illustrated a Bayesian analysis of the single mediator model from prior selection to interpreting results.     

How can a Website for Physics Teachers Serve as a Tool for Professional Development?

Misconceptions among students studying physics have been widely reported in the research literature. Many teachers are not acquainted with this literature. Moreover, many of them claim that only weak students have misconceptions. This paper reports on an online activity focusing on misconceptions of students regarding Newton’s 3rd Law, that is being carried out through the website of the National Center of Physics Teachers. The aims of the activity are: (1) To convince the teachers that sometimes difficulties in understanding concepts do not stem from the inability of certain students to understand the concept, but rather because of misconceptions in physics. (2) To present the teachers with the findings of studies on physics instruction that deal with the concepts under discussion. (3) To convince the teachers to try out new, innovative teaching strategies.     

Artifactual dimensions of visual rhetoric: what a content analysis of 114 peer-reviewed articles reveals about data collection reporting

This content analysis examined how the authors of 114 peer-reviewed journal articles explained their empirical approaches to visual rhetoric scholarship. The authors content analysis sought to answer the question: how do scholars engage with the material dimensions of visual culture, specifically in terms of artifact selection and reporting data collection procedures? The answers to this question, the authors argue, are needed urgently as visual rhetoric research continues to expand because inconsistent reporting will hinder replicability and the reader’s access to the author’s argument. The authors use the findings of their content analysis to surface the implicit norms of empirical visual rhetoric research and to develop recommendations for reporting visual data collection procedures.     

Reliability of the International Physical Activity Questionnaire in Research Settings: Last 7-Day Self-Administered Long Form

This study examined the validity and reliability of decisional balance scales for exercise (i.e., pros and cons) in a large longitudinal population-based randomized sample of Canadian adults ages 18 to 65 years (N = 703). Assessments were taken over 3 time points with 6-month intervals between testing. Content, factorial, concurrent, and construct validity along with internal consistency and test-retest reliability were established for the decisional balance scales. The developed measures have utility for researchers and practitioners who test and apply the exercise decisional balance constructs of the Transtheoretical Model.     

Submaximal and Peak Cardiorespiratory Response After Moderate-High Intensity Exercise Training in Subacute Stroke

Purpose

Reduced cardiovascular fitness post-stroke may negatively impact recovery. There is little information regarding exercise testing performance and cardiorespiratory response to an aerobic exercise intervention in subacute stroke. The purpose of this study was to examine cardiorespiratory response in subacute stroke after an 8-week aerobic exercise intervention using a total body recumbent stepper (TBRS).

Methods

Nine individuals with mean age 61.2 (SD 4.7) years and mean 66.7 (SD 41.5) days post-stroke completed the exercise intervention. Participants had a mean Fugl-Meyer score of 100.3 (SD 29.3). Outcome measures were obtained at baseline and postintervention. A peak exercise test using a TBRS assessed oxygen consumption, heart rate, and minute ventilation. Participants completed an 8-week exercise intervention on a recumbent stepper 3 times per week at a prescribed heart rate intensity.

Results

Submaximal VO₂ was significantly lower from baseline to postintervention with a main effect of Study Visit (F_1,8 = 8.5, p = 0.02). Heart rate was not significantly different pre- to postintervention. Minute ventilation exhibited no main effect of Study Visit or Test Minute.

Conclusion

Moderate-high intensity aerobic exercise in subacute stroke appears to be beneficial for improving cardiovascular outcomes during submaximal performance of an exercise test.Key Words: oxygen uptake, cerebrovascular accident, cardiovascular fitness, submaximal exercise     

Auditory temporal structure processing in dyslexia: processing of prosodic phrase boundaries is not impaired in children with dyslexia

Reading disability in children with dyslexia has been proposed to reflect impairment in auditory timing perception. We investigated one aspect of timing perception—temporal grouping—as present in prosodic phrase boundaries of natural speech, in age-matched groups of children, ages 6–8 years, with and without dyslexia. Prosodic phrase boundaries are characterized by temporal grouping of functionally related speech elements and can facilitate syntactic processing of speech. For example, temporary syntactic ambiguities, such as early-closure structures, are processed faster when prosodic phrase boundaries are present. We examined children’s prosodic facilitation by measuring their efficiency of sentence processing for temporary syntactic ambiguities spoken with (facilitating) versus without (neutral) prosodic phrase boundaries. Both groups of children benefited similarly from prosodic facilitation, displaying faster reaction times in facilitating compared to neutral prosody. These findings indicate that the use of prosodic phrase boundaries for speech processing is not impaired in children with dyslexia.     

A methodological framework for practice-based research in networked learning

This paper presents a methodological frameworkfor practice-based research in the field ofnetworked learning, based on the author'sapproach to carrying out a case studyevaluation of a networked professionaldevelopment initiative for information servicesstaff in higher education. The theoreticalcase for the framework is made with referenceto principles associated with constructivistprogramme evaluation as well as withinterpretivist and critical traditions inaction research. The purposes and politics ofthis approach, and the question of validationcriteria for claims about its effectiveness forbuilding theory, as well as for evaluating andimproving practice, are discussed. Issues todo with using computer-mediated communicationas a medium for participatory research are alsoraised. An overview is given of the way thisresearch approach was implemented in practice(including the use of a combination of on-lineand face-to-face data collection methods) andsome methodological issues that arose in thecourse of carrying it out are highlighted. Thepaper concludes by suggesting that as amethodology for evaluating, theorising andimproving practice, `networked action research'also offers an approach to pedagogical design,most obviously in the context of networkedprofessional development for educators andlearner support staff.     

Integrating Research into Television Production: Square One TV and the case of “Pauline”

Within the field of formative research, there is debate as to whether researchers should collaborate with producers or serve as independent evaluators. The Children's Television Workshop (CTW) produces educational programs through a collaborative process of development that has come to be known as the “CTW Model”. Under the CTW Model, producers, content specialists, and researchers work together throughout the life of a project, from its initial conceptualization through its final production. This paper illustrates the value of the CTW Model via an in‐depth case study of the development and production of a single repeated format within Square One TV, an educational television series about mathematics. In particular, we focus on the multifaceted role played by formative research at all stages of production.     

In amongst the glitter and the squashed blueberries: crafting a collaborative lens for children’s literacy pedagogy in a community setting

ABSTRACT

In this article, we bring together relational arts practice (Kester, 2004) with collaborative ethnography (Campbell and Lassiter, 2015) in order to propose art not as a way of teaching children literacy, but as a lens to enable researchers and practitioners to view children’s literacies differently. Both relational arts practice and collaborative ethnography decentre researcher/artist expertise, providing an understanding that “knowing” is embodied, material and tacit (Ingold, 2013). This has led us to extend understandings of multimodal literacy to stress the embodied and situated nature of meaning making, viewed through a collaborative lens (Hackett, 2014a; Heydon and Rowsell, 2015; Kuby et al, 2015; Pahl and Pool, 2011). We illustrate this approach to researching literacy pedagogy by offering a series of “little” (Olsson, 2013) moments of place/body memory (Somerville, 2013), which emerged from our collaborative dialogic research at a series of den building events for families and their young children. Within our study, an arts practice lens offered a more situated, and entwined way of working that led to joint and blurred outcomes in relation to literacy pedagogy.     

How much is transferred from training to the job? The 10% delusion as a catalyst for thinking about transfer

This article explores the common belief that only a small amount of what is taught in a training program is actually transferred to the job. After providing evidence of the source of the generalization and the acceptance of the notion despite the lack of empirical, behavioral evidence, we take the opportunity to examine the likely reasons for that acceptance. We present five questionable assumptions behind the generalization about minimal transfer. Based on this analysis, we offer four practical strategies for planning, assessing, and reporting training transfer. These strategies include investigating and accounting for variables influencing transfer, expanding the definition of use, stating realistic transfer goals, creating specific transfer objectives, describing observable indicators of use, setting quantitative standards of successful transfer, and reporting the complete transfer story. These strategies provide avenues for producing a more accurate picture of the training transfer experience.