This study investigates the effect of several design and administration choices on item exposure and person/item parameter recovery under a multistage test (MST) design. In a simulation study, we examine whether number-correct (NC) or item response theory (IRT) methods are differentially effective at routing students to the correct next stage(s)…

This paper compares the use of confidence intervals (CIs) and a sensitivity analysis called the number needed to disturb (NNTD), in the analysis of research findings expressed as 'effect' sizes. Using 1,000 simulations of randomised trials with up to 1,000 cases in each, the paper shows that both approaches are very similar in outcomes, and each…

There are some educational interventions aimed at changing the ways in which individuals interact, and social networks are particularly useful for quantifying these changes. For many of these interventions, the ultimate goal is to change some outcome of interest such as teacher quality or student achievement, and social networks act as a natural…

Scores estimated from multidimensional item response theory (IRT) models are not necessarily comparable across dimensions. In this article, the concept of aligned dimensions is formalized in the context of Rasch models, and two methods are described--delta dimensional alignment (DDA) and logistic regression alignment (LRA)--to transform estimated…

Research has shown that cross-sectional mediation analysis cannot accurately reflect a true longitudinal mediated effect. To investigate longitudinal mediated effects, different longitudinal mediation models have been proposed and these models focus on different research questions related to longitudinal mediation. When fitting mediation models to…

Teachers play a critical role in bullying prevention but often struggle to identify bullying and intervene effectively, particularly in real time and in the classroom. The coaching literature suggests that ongoing, tailored supports are often needed to promote changes in teacher practices. The purpose of this study was to examine the efficacy of…

Researchers frequently evaluate rater judgments in performance assessments for evidence of differential rater functioning (DRF), which occurs when rater severity is systematically related to construct-irrelevant student characteristics after controlling for student achievement levels. However, researchers have observed that methods for detecting…

Agent-based models combine data and theory during both development and use of the model. As models have become increasingly data driven, it is easy to start thinking of agent-based modelling as an empirical method, akin to statistical modelling, and reduce the role of theory. We argue that both types of information are important where the past is…

This study shows that residual variation can cause problems related to scaling in exponential random graph models (ERGM). Residual variation is likely to exist when there are unmeasured variables in a model--even those uncorrelated with other predictors--or when the logistic form of the model is inappropriate. As a consequence, coefficients cannot…

Modern communication between health care professionals and patients increasingly relies upon secure messages (SMs) exchanged through an electronic patient portal. Despite the convenience of secure messaging, challenges include gaps between physician and patient expertise along with the asynchronous nature of such communication. Importantly, less…

This study explores how pre-service mathematics teachers build alternative model simulations of real-world scenarios. Inclusion in the formal structures for wealth generation and accumulation is a fervently debated issue in South Africa. Share owning in companies listed on the Johannesburg Stock Exchange (JSE) in South Africa is one of many…

Aim/Purpose: The aim of this study was to explore whether a full cost flight training device (FTD) was significantly better for simulator training than a low cost PC-Based Aviation Training Device (PCATD). Background: A quasi-transfer study was undertaken to ascertain whether a Civil Aviation Authority certified Flight Training Device (FTD) was…

The purpose of this study was to understand the ways doctoral students in an online Ed.D. program developed their skills as practitioner researchers through a project-based learning (PBL) experience. In order to describe and analyze the nature of the students' PBL experiences, case study methodology was used. Interviews, a video-recording of a…

To develop a simulation is to construct a new reality, one where students can safely engage with the course materials, so as to achieve the intended learning outcomes. While there are a wide range of studies that review the utility of simulations in the classroom, the construction of the alternate reality--the pseudo-reality--is a less discussed…

This article explores the hidden educational potential in the board game "Diplomacy." While commonly recognized as a good low-cost negotiation simulation and a useful teaching platform, the original game version over-emphasizes the conflictual nature of international relations and presents an image of international relations that is not…