Background: Previous research indicated a high prevalence of disordered sleep among adults with learning disabilities, however issues with design impacted findings. The current systematic review aims to: (1) present how disordered sleep and sleep disorders amongst adults with learning disabilities are described in the literature, and (2) report on…

Single-case design is a research methodology that entails repeated measurement to assess the influence of an independent variable on a dependent variable over time. Data collected in this manner are regularly analyzed using visual analysis of data displayed in a linear graph. Although there is agreement regarding critical elements of visual…

This methodological brief introduces researchers to QuantCrit, a set of tenets complementary to critical race theory, to specifically reexamine how race and racism are analyzed through quantitative methodologies. We outline the tenets of QuantCrit, review recent quantitative research in gifted education for examples aligned with QuantCrit tenets,…

Researchers increasingly take advantage of the comparative case design to build theory, but the degree of case dependence is occasionally discussed and theorized. We suggest that the comparative case study design might be subject to an often underappreciated threat--dependence across cases--under certain conditions. Using research on innovation…

Randomized response techniques (RRTs) are useful survey tools for estimating the prevalence of sensitive issues, such as the prevalence of doping in elite sports. One type of RRT, the unrelated question model (UQM), has become widely used because of its psychological acceptability for study participants and its favorable statistical properties.…

In this essay, we focus on methodological issues that reviewers and editors commonly encounter when evaluating empirical articles in scholarship of teaching and learning in management education. We organize our discussion around three stages--design, analysis, and reporting. The essay identifies which types of issues are likely to receive…

What is the science of reading? The Reading League, in their document "Science of Reading: Defining Guide" (TRL, 2022), proposes that "The science of reading is a vast, interdisciplinary body of scientifically-based* research about reading and issues related to reading and writing." (p. 11.) The asterisk is carrying a lot of…

Studies of autistic traits in the general population are becoming increasingly prevalent. In this letter to the editor, we caution researchers against framing and interpreting studies of autistic traits in the general population as extending to autism and implore them to be clear about when their study sample does and does not include autistic…

Visual analysis is the predominant method of analysis in single-case research (SCR). However, most research suggests that agreement between visual analysts is poor, which may be due to a lack of clear guidelines and criteria for visual analysis, as well as variability in how individuals are trained. We developed a survey containing questions about…

Practitioners and policymakers often want estimates of the effect of an intervention for their local community, e.g., region, state, county. In the ideal, these multiple population average treatment effect (ATE) estimates will be considered in the design of a single randomized trial. Methods for sample selection for generalizing the sample ATE to…

In episodic memory research, there is a debate concerning whether decision-making in item recognition and source memory is better explained by models that assume all-or-none retrieval processes or continuous underlying strengths. One aspect in which these classes of models tend to differ is their predictions regarding the ability to retrieve…

The application of physico-chemical principles has been routinely used to explain various physiological concepts. The Nernst equation is one example of this, used to predict the potential difference created by the transmembrane ion gradient resulting from uneven ion distribution within cellular compartments and the interstitial space. This…

Background: Down Syndrome is the most common genetic disorder associated with intellectual and developmental disabilities. Research to improve health care outcomes in Down Syndrome lags significantly behind other disease categories. Among these reasons are funding, recruitment and availability of research studies being conducted. Methods: We…

Single-case experimental designs (SCEDs) are frequently used to evaluate whether a functional relation exists between interventions and student outcomes. A critical factor in decision making is the evaluation of graphical data, typically displayed in time-series graphs. Distortion in the graphical display of data can lead to invalid decisions on…

Common method variance refers to the amount of uncontrolled systematic error leading to biased estimates of scale reliability and validity and to spurious covariance shared among variables due to common method and/or common source employed in survey-based researches. As the extended use of self-report questionnaires is inevitable, numerous studies…