This book develops an intuitive understanding of IRT principles through the use of graphical displays and analogies to familiar psychological principles. It surveys contemporary IRT models, estimation methods, and computer programs. Polytomous IRT models are given central coverage since many psychological tests use rating scales.Ideal for clinical, industrial, counseling, educational, and behavioral medicine professionals and students familiar with classical testing principles, exposure to material covered in first-year graduate statistics courses is helpful. All symbols and equations are thoroughly explained verbally and graphically.

An intuitive intro to IRT that minimizes equations and maximizes the use of graphs and analogies to psychologicalprinciples.Includes small-scale cognitive applications. Ideal for psychology professionals, behavioral scientists, and grad students.