This comprehensive "Handbook" focuses on the most used polytomous item response theory (IRT) models. These models help us understand the interaction between examinees and test questions where the questions have various response categories. The book reviews all of the major models and includes discussions about how and where the models…

The authors center their presentation of material around a conceptual understanding of psychometric issues, such as validity and reliability, and on purpose rather than procedure, the "why" rather than the "how to." Their goal is to introduce psychometric principles at a level that is deeper and more focused than found in introductory…

This document aims to support graduate students who are in the process of preparing graduate theses or dissertations, and is organized according to the planning, research, and writing phases. The function of theses and dissertations is to provide students with experience in conducting and presenting research and to add to the body of knowledge in…