This article develops new closed-form variance expressions for power analyses for commonly used difference-in-differences (DID) and comparative interrupted time series (CITS) panel data estimators. The main contribution is to incorporate variation in treatment timing into the analysis. The power formulas also account for other key design features…

Inclusive, quality education promotes understanding, tolerance and peaceful coexistence among individuals and communities. Education holds the potential to reduce the likelihood of conflicts by fostering critical thinking, encouraging open dialogue and creating economic growth opportunities. The world urgently needs to recognize the role of…

A procedure for one-pot preparation and characterization of silver 1D nanostructures is described. The main advantages of this synthetic approach are the simplicity and reproducibility, where the size of the final product can be controlled just by changing the reaction time. This experiment is designed as a laboratory introduction to colloidal…

Research has shown that students who are healthier and have access to opportunities for physical activity may achieve improved academic achievement. However, challenges with classroom and behavior management can be disruptive to learning opportunities in physical education classes. A combination of a comprehensive school physical activity program…

Teaching foreign languages has become a major goal for many education systems around the world. In today's increasingly interconnected world, speaking multiple languages improves employability, fosters respect for people from other cultures, and gives young people direct access to content that would otherwise be inaccessible, including literature,…

The intervention of interest in this review is paper (hard copy) book reading, e-book reading or audiobook listening as a leisure activity ("reading for pleasure" or "recreational reading"). These interventions include lone reading, as well as reading aloud in a one-on-one setting, and being read to in a one-on-one setting.…

Student academic burden exists to varying degrees throughout the world. To reach a comprehensive and unbiased understanding of the roles of academic burden, this paper explores academic burden from different viewpoints and summarizes existing assessment indexes for it. Factors correlated with student academic burden are examined and detailed…

In this article, we present a framework for exploring participation in and social stratification of movement culture based on Pierre Bourdieu's concept logic of practice. The background to our approach is Lars-Magnus Engström's struggle to understand the impact of social stratification on participation in movement culture in a now nearly…

In Miyamoto et al. (2015, this issue) the authors looked to substantiate the presence of the spacing effect, referenced from the psychology literature, in several MOOCs. Their secondary analyses constituted a robust, empirical finding on the correspondence between session distribution and certification but with only a coarse, analogous…

Much has been made of the flipped classroom as an approach to teaching, and its effect on student learning. The volume of material showing that the flipped classroom technique helps students better learn and better retain material is increasing at a rapid pace. Coupled with this technique is active learning in the classroom. There are many ways of…

This paper briefly discusses four measurement challenges of data science or "big data" in educational assessments that are enabled by technology: 1. Dealing with change over time via time-based data. 2. How a digital performance space's relationships interact with learner actions, communications and products. 3. How layers of…

In this article, fourth grade Upper Allen Elementary School (Mechanicsburg, Pennsylvania) teacher Jeffrey Smith describes his exploration of the Playing Basketball activity. Herein he describes how he found the problem to be an effective way to review concepts associated with the measurement of elapsed time with his students. Additionally, it…

The first part of this article focused on providing the reader with a general overview of the concept of time with special emphasis on understanding time's role in the structure of personality theories and their associated therapeutic approaches, as well as linking the discussion to the understanding of time in the context of psychosocial…

Research in the field of mental chronometry and individual differences has revealed several robust regularities (Jensen, 2006). These include right-skewed response time (RT) distributions, the worst performance rule, correlations with general intelligence ("g") that are more pronounced for RT standard deviations (RTSD) than they are for RT means…

The purpose of this review is to systematically uncover relevant studies in the literature that measure the effects of class size on academic achievement. The review will synthesize the effects in a transparent manner and, where possible, the review will investigate the extent to which the effects differ among different groups of students such as…