Rasch analysis is a special case of IRT used to understand the fit of item responses to a ‘Rasch’ pattern and derive scores from assessments in a common (interval) metric, usually expressed as ‘logits’ (log odds units). It does so by assuming that the data have a unidimensional structure and that all items are equally ‘discriminating’ in IRT terms.
Glossary
Rasch analysis/calibration
Glossary
Summary (bullet points)
Rasch analysis can be used to derive an interval metric from psychological assessments, though is based on strong assumptions.
Classification (s)
Research term
Classification (s)
Statistics
Foundational paper (s)
Rasch, G. (1960). Probabilistic model for some intelligence and achievement tests. Copenhagen: Danish Institute for Educational Research.