@article {420,
	title = {Utilizing Rasch measurement models to develop a computer adaptive self-report of walking, climbing, and running},
	journal = {Disability and Rehabilitation},
	volume = {30},
	number = {6},
	year = {2008},
	pages = {458-467},
	abstract = {Purpose.The purpose of this paper is to show how the Rasch model can be used to develop a computer adaptive self-report of walking, climbing, and running.Method.Our instrument development work on the walking/climbing/running construct of the ICF Activity Measure was used to show how to develop a computer adaptive test (CAT). Fit of the items to the Rasch model and validation of the item difficulty hierarchy was accomplished using Winsteps software. Standard error was used as a stopping rule for the CAT. Finally, person abilities were connected to items difficulties using Rasch analysis {\textquoteleft}maps{\textquoteright}.Results.All but the walking one mile item fit the Rasch measurement model. A CAT was developed which selectively presented items based on the last calibrated person ability measure and was designed to stop when standard error decreased to a pre-set criterion. Finally, person ability measures were connected to the ability to perform specific walking/climbing/running activities using Rasch maps.Conclusions.Rasch measurement models can be useful in developing CAT measures for rehabilitation and disability. In addition to CATs reducing respondent burden, the connection of person measures to item difficulties may be important for the clinical interpretation of measures.Read More: http://informahealthcare.com/doi/abs/10.1080/09638280701617317},
	author = {Velozo, C. A. and Wang, Y. and Lehman, L. A. and Wang, J. H.}
}
@article {419,
	title = {The use of Rasch analysis to produce scale-free measurement of functional ability},
	journal = {American Journal of Occupational Therapy},
	volume = {53},
	number = {1},
	year = {1999},
	note = {991250470272-9490Journal Article},
	pages = {83-90},
	abstract = {Innovative applications of Rasch analysis can lead to solutions for traditional measurement problems and can produce new assessment applications in occupational therapy and health care practice. First, Rasch analysis is a mechanism that translates scores across similar functional ability assessments, thus enabling the comparison of functional ability outcomes measured by different instruments. This will allow for the meaningful tracking of functional ability outcomes across the continuum of care. Second, once the item-difficulty order of an instrument or item bank is established by Rasch analysis, computerized adaptive testing can be used to target items to the patient{\textquoteright}s ability level, reducing assessment length by as much as one half. More importantly, Rasch analysis can provide the foundation for "equiprecise" measurement or the potential to have precise measurement across all levels of functional ability. The use of Rasch analysis to create scale-free measurement of functional ability demonstrates how this methodlogy can be used in practical applications of clinical and outcome assessment.},
	keywords = {*Activities of Daily Living, Disabled Persons/*classification, Human, Occupational Therapy/*methods, Predictive Value of Tests, Questionnaires/standards, Sensitivity and Specificity},
	author = {Velozo, C. A. and Kielhofner, G. and Lai, J-S.}
}
