Care must be taken representing waves traveling in opposite directions. Erroneous results can occur when combining waves with the popular convention where a wave traveling to the right is [psi][subscript R] (x,t) = A sin (kx-[omega]t) and a left-traveling wave is [psi] (x,t) = A sin (kx + [omega]t). An easily overlooked pitfall is pointed out and…

Background: In secure residential facilities, group climate perceptions of clients with mild intellectual disability or borderline intellectual functioning are systematically assessed for quality improvement. A valid and reliable measure may ensure that this process is consistent. The Group Climate Inventory--Revised (GCI-R) is a new measure to…

The factor structure of the measure of school engagement 'Engagement Versus Disaffection with Learning: Teacher Report' was investigated in the sample of 360 Swedish 6th graders. Confirmatory factor analyses showed no support for the suggested four-factor structure including behavioural engagement, emotional engagement, behavioural disaffection…

The academic buoyancy scale (ABS) is one of the most widely used instruments for measuring academic buoyancy. To obtain meaningful and valid comparisons across groups using ABS, however, measurement invariance should be ascertained a priori. To that end, we examined its measurement invariance, validity evidence based on relations to other…

Although there is a robust body of research that has addressed the psychometric properties of the Learning and Study Strategies Inventory (LASSI) in different populations, no study has yet investigated the factor structure and congeneric reliability of the Arabic version of the Learning and Study Strategies Inventory, 2nd edition (LASSI-II) among…

Cheating detection is an important issue in standardized testing, especially in large-scale settings. Statistical approaches are often computationally intensive and require specialised software to conduct. We present a two-stage approach that quickly filters suspected groups using statistical testing on an IRT-based answer-copying index. We also…

The present investigation aims to test the validity of scores on the math homework purpose scale (MHPS) for high school students. Factorial results found that the MHPS contained three subscales: academic purpose, self-regulatory purpose, and approval-seeking purpose. Furthermore, the MHPS had a sufficient level of measurement and latent factor…

The study aimed to test the psychometric properties of a Portuguese adaptation of the "Adolescent Students' Basic Psychological Needs at School Scale" (ASBPNSS). For this, we used data from a sample of eighth graders (N = 1648; M[[subscript age] = 14.1 years; 46.9% girls) from Portugal. Cronbach alpha and omega coefficients showed the…

The diversity in classrooms has increased worldwide. An equitable learning experience is the desired outcome. When planning instruction teachers must attend to the varied needs of their diverse students. The study presents a survey that assesses preservice teachers' use of different modalities of multiliteracies, new literacies, and literacy…

Traditional estimators of reliability such as coefficients alpha, theta, omega, and rho (maximal reliability) are prone to give radical underestimates of reliability for the tests common when testing educational achievement. These tests are often structured by widely deviating item difficulties. This is a typical pattern where the traditional…

The Adult Prosocialness Behavior Scale (APBS) is most often used to measure adult prosociality. We conducted a reliability generalization meta-analysis to compute the average APBS reliability and examine the heterogeneity among reliability estimations and the influence of moderator variables. An exhaustive search identified 74 articles that…

This article presents a ten-item short scale for measuring digital competence. The scale is based on the Digital Competence Framework for Citizens, DigComp2.1 (Carretero et al., 2017). For our surveys, we used five items from the DigCompSat study (Clifford et al., 2020) and created five new ones to address the competence areas defined by…

The Academic Intrinsic Motivation Scale (AIMS) measures key components of student intrinsic motivation (IM). We investigate score validity and reliability of a downward extension of the AIMS developed for students in the high school context using a sample of students from the Pacific Northwest region of the United States. Through classical test…

USDA helps millions of children from low-income households access healthy meals by purchasing food, including seafood, for the NSLP. USDA-purchased foods represent about 15 to 20 percent of the food served in the NSLP. According to the DGA, programs, such as the NSLP, can play an essential role in providing access to healthy meals. This can help…

Limited inquiries exist for perceptions of physical competence for people with visual impairments, since there are no specific, psychometrically tested scales. The purpose of this study was to establish the psychometric properties of the Test of Perceived Physical Competence (TPPC) for individuals with visual impairments aged 9-19 years. Methods:…