1. Improving Measurement Methods in Rehabilitation: Core Concepts and Recommendations for Scale Development 
Craig A. Velozo, PhD, Ronald T. Seel, PhD, Susan Magasi, PhD, Allen W. Heinemann, PhD, Sergio Romero, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 93, Issue 8, Pages S154-S163 (August 2012)
DOI: /j.apmr
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions

2. Fig 1 Example of item characteristic curve.
Archives of Physical Medicine and Rehabilitation  , S154-S163DOI: ( /j.apmr )
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions

3. Fig 2
Standard measurement error plots for a CAT of physical function and 3 legacy measures of physical function. Abbreviations: HAQ, Health Assessment Questionnaire; SF-12, Short Form-12; SF-36, Short Form-36; WOMAC, Western Ontario and McMaster Universities Arthritis Index.
Adapted from Rose et al.50 Reprinted with permission.
Archives of Physical Medicine and Rehabilitation  , S154-S163DOI: ( /j.apmr )
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions