Reliability is the consistency of a set of scores that are designed to measure the same thing. Reliability is a statistical property of scores that must be demonstrated rather than assumed.

The term "fidelity" is often used in educational contexts to describe the degree to which a practitioner follows the prescribed directions when delivering an instructional program (Sanetti & Kratochwill, 2009; Dane & Schneider, 1998). Within a Response to Intervention (RTI) framework, the term fidelity also extends to assessment…

Researchers often compare the relationship between an outcome and covariate for two or more groups by evaluating whether the fitted regression curves differ significantly. When they do, researchers need to determine the "significance region," or the values of the covariate where the curves significantly differ. In analysis of covariance (ANCOVA),…

Exploratory factor analysis (EFA) is a frequently used multivariate analysis technique in statistics. Jennrich and Sampson (1966) solved a significant EFA factor loading matrix rotation problem by deriving the direct Quartimin rotation. Jennrich was also the first to develop standard errors for rotated solutions, although these have still not made…

There is variability in the estimation of an equating transformation because common-item parameters are obtained from responses of samples of examinees. The most commonly used standard error of equating quantifies this source of sampling error, which decreases as the sample size of examinees used to derive the transformation increases. In a…

The four 1984 quarterly numbers of the journal include feature articles, techniques for teaching English as a second language (ESL), research summaries, and book reviews. The feature articles include: "The English Language Center at King Faisal University"; "English Language Training at ARAMCO"; "AlBank AlSaudi AlHollandi's Practical English…