Using Item Response Theory to Evaluate Measurement Invariance in Health-Related Measures

Authored by: Roger E. Millsap , Heather Gunn , Howard T. Everson , Alex Zautra

Handbook of Item Response Theory Modeling

Print publication date:  December  2014
Online publication date:  November  2014

Print ISBN: 9781848729728
eBook ISBN: 9781315736013
Adobe ISBN: 9781317565703


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For more than a decade, the National Institutes of Health (NIH) has supported the development of the Patient Reported Outcomes Information System (PROMIS®) Roadmap initiative ( This effort reflects the growing importance of and interest in the use of measures of patients’ self-reported health status in medical and health care research, as well as in clinical practice. The goal of the NIH initiative is to support the development of a large bank of items for measuring patient-reported outcomes (PROs), which, ultimately, could be assembled into measurement scales for use in both clinical and research settings. With NIH support the PROMIS® development initiative has been able to make both the items and the scales available to clinicians and researchers (Cella et al., 2007).

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