The generalizability of student ratings of instructors: Item specificity and section effects

A number of recent studies have used generalizability theory to examine the dependability of student ratings of instruction. This study extends this line of research by examining the consistency of ratings between different sections of a course taught in a given semester by the same instructor, and by comparing the performance of global- and attribute-type instructor rating items. Five samples of physics instructors, varying in size from 5 to 12 instructors, were rated by their students on a form containing two global and eight attribute items. Each instructor taught two sections of a course. The study found that the section effect was small (ratings of instructors were consistent across different sections of the same course), and that the generalizability of ratings was substantially influenced by item specificity. For summary purposes, one global item seemed sufficient.     

The influence of elbow joint kinematics on wrist speed in cricket fast bowling

This modelling study sought to describe the relationships between elbow joint kinematics and wrist joint linear velocity in cricket fast bowlers, and to assess the sensitivity of wrist velocity to systematic manipulations of empirical joint kinematic profiles. A 12-camera Vicon motion analysis system operating at 250 Hz recorded the bowling actions of 12 high performance fast bowlers. Empirical elbow joint kinematic data were entered into a cricket bowling specific “Forward Kinematic Model” and then subsequently underwent fixed angle, angular offset and angle amplification manipulations. A combination of 20° flexion and 20° abduction at the elbow was shown to maximise wrist velocity within the experimental limits. An increased elbow flexion offset manipulation elicited an increase in wrist velocity. Amplification of elbow joint flexion–extension angular displacement indicated that, contrary to previous research, elbow extension range of motion and angular velocity at the time of ball release were negatively related to wrist velocity. Some relationships between manipulated joint angular waveforms and wrist velocity were non-linear, supporting the use of a model that accounts for the non-linear relationships between execution and outcome variables in assessing the relationships between elbow joint kinematics and wrist joint velocity in cricket fast bowlers.     

Inferences About Variance Components and Reliability-Generalizability Coefficients in the Absence of Random Sampling

Generalizability theory (G theory) employs random-effects ANOVA to estimate the variance components included in generalizability coefficients, standard errors, and other indices of precision. The ANOVA models depend on random sampling assumptions, and the variance-component estimates are likely to be sensitive to violations of these assumptions. Yet, generalizability studies do not typically sample randomly. This kind of inconsistency between assumptions in statistical models and actual data collection procedures is not uncommon in science, but it does raise fundamental questions about the substantive inferences based on the statistical analyses. This article reviews criticisms of sampling assumptions in G theory (and in reliability theory) and examines the feasibility of using representative sampling, stratification, homogeneity assumptions, and replications to address these criticisms.     

BioOne and SPIE: A reflection on the first 3 years of the nonprofit platform partnership

• There is great potential for organizations to form collaborative partnerships, particularly in the nonprofit environment, which can reduce costs and aid in strategic development.
• Regular and transparent communication with internal and external stakeholders is critical to the health of any partnership, especially when doing something new or novel.
• Reciprocal service-level agreements with clear expectations and ongoing evaluation ensure the collaboration keeps pace with commercial alternatives.
• The SPIE-BioOne partnership was built to scale and incorporate future collaborators to further reduce costs and bring new ideas to the user group.