Close

Glossary

Item Response Theory (IRT)

Item Response Theory (IRT) or modelling is a psychometric approach which seeks to understand the properties of assessments and their questions (items) via probabilistic modelling. That is, the relationship between an item’s properties and the probability of a candidate answering in a certain way is modelled using probability distributions. This is in contrast to classicial test theory (see below). Rasch analysis is usually considered as a special case of IRT (see also below)

Glossary

Summary (bullet points)

IRT models test and item properties in a probabilistic manner

Classification (s)

Research term

Classification (s)

Statistics