TY - JOUR T1 - Simulated computerized adaptive tests for measuring functional status were efficient with good discriminant validity in patients with hip, knee, or foot/ankle impairments JF - Journal of Clinical Epidemiology Y1 - 2005 A1 - Hart, D. L. A1 - Mioduski, J. E. A1 - Stratford, P. W. KW - *Health Status Indicators KW - Activities of Daily Living KW - Adolescent KW - Adult KW - Aged KW - Aged, 80 and over KW - Ankle Joint/physiopathology KW - Diagnosis, Computer-Assisted/*methods KW - Female KW - Hip Joint/physiopathology KW - Humans KW - Joint Diseases/physiopathology/*rehabilitation KW - Knee Joint/physiopathology KW - Lower Extremity/*physiopathology KW - Male KW - Middle Aged KW - Research Support, N.I.H., Extramural KW - Research Support, U.S. Gov't, P.H.S. KW - Retrospective Studies AB - BACKGROUND AND OBJECTIVE: To develop computerized adaptive tests (CATs) designed to assess lower extremity functional status (FS) in people with lower extremity impairments using items from the Lower Extremity Functional Scale and compare discriminant validity of FS measures generated using all items analyzed with a rating scale Item Response Theory model (theta(IRT)) and measures generated using the simulated CATs (theta(CAT)). METHODS: Secondary analysis of retrospective intake rehabilitation data. RESULTS: Unidimensionality of items was strong, and local independence of items was adequate. Differential item functioning (DIF) affected item calibration related to body part, that is, hip, knee, or foot/ankle, but DIF did not affect item calibration for symptom acuity, gender, age, or surgical history. Therefore, patients were separated into three body part specific groups. The rating scale model fit all three data sets well. Three body part specific CATs were developed: each was 70% more efficient than using all LEFS items to estimate FS measures. theta(IRT) and theta(CAT) measures discriminated patients by symptom acuity, age, and surgical history in similar ways. theta(CAT) measures were as precise as theta(IRT) measures. CONCLUSION: Body part-specific simulated CATs were efficient and produced precise measures of FS with good discriminant validity. VL - 58 N1 - 0895-4356 (Print)Journal ArticleMulticenter StudyValidation Studies ER - TY - JOUR T1 - Computerization and adaptive administration of the NEO PI-R JF - Assessment Y1 - 2000 A1 - Reise, S. P. A1 - Henson, J. M. KW - *Personality Inventory KW - Algorithms KW - California KW - Diagnosis, Computer-Assisted/*methods KW - Humans KW - Models, Psychological KW - Psychometrics/methods KW - Reproducibility of Results AB - This study asks, how well does an item response theory (IRT) based computerized adaptive NEO PI-R work? To explore this question, real-data simulations (N = 1,059) were used to evaluate a maximum information item selection computerized adaptive test (CAT) algorithm. Findings indicated satisfactory recovery of full-scale facet scores with the administration of around four items per facet scale. Thus, the NEO PI-R could be reduced in half with little loss in precision by CAT administration. However, results also indicated that the CAT algorithm was not necessary. We found that for many scales, administering the "best" four items per facet scale would have produced similar results. In the conclusion, we discuss the future of computerized personality assessment and describe the role IRT methods might play in such assessments. VL - 7 N1 - 1073-1911 (Print)Journal Article ER -