When Item Response Theory (IRT) is operationally applied for large scale assessments, unidimensionality is typically assumed. This assumption requires that the test measures a single latent trait. Furthermore, when tests are vertically scaled using IRT, the assumption of unidimensionality would require that the battery of tests across grades…

Bullying victimization is part of the adolescent experience in most societies, yet little is known about its consequences. In this article we utilize a multisite, longitudinal data set to examine the effects of being bullied. We also explore definitional and measurement issues that confound this line of research. While some researchers have relied…

Describes a study of reliability among coders of information for meta-analysis (a quantitative procedure for synthesizing data in primary research reports) of research on life satisfaction in American adults. Identifies sources and areas of disagreement among coders and discusses measures that can be used to enhance intercoder consistency.…