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IRT, item response theory
- Deriving summary indices of health status from the Amyotrophic Lateral Sclerosis Assessment Questionnaires (ALSAQ-40 and ALSAQ-5)C Jenkinson, J M Norquist, R FitzpatrickJournal of Neurology, Neurosurgery & Psychiatry Feb 2003, 74 (2) 242-245; DOI: 10.1136/jnnp.74.2.242
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