Use of Rasch person-item map in exploratory data analysis: A clinical perspective

Joan Stelmack, Janet P. Szlyk, Thomas Stelmack, Judith Babcock-Parziale, Paulette Demers-Turco, R. Tracy Williams, Robert W. Massof

Research output: Contribution to journalReview articlepeer-review

50 Scopus citations


The National Institutes of Health (NIH) includes visual impairment in the 10 most prevalent causes of disability in America. As rehabilitation programs have the potential to restore independence and improve the quality of life for affected persons, NIH research priorities include evaluating their effectiveness. This paper demonstrates a clinical perspective on the use of the Rasch person-item map to evaluate the range and precision of a new vision function questionnaire in early analysis (prior to full sample). A self-report questionnaire was developed to measure the difficulty that persons with different levels of vision loss have performing daily activities. This 48-item Veterans Affairs Low-Vision Visual Functioning Questionnaire (VA LV VFQ-48) was administered to 117 low-vision patients. Preliminary analysis indicates that the questionnaire items are applicable to persons of differing abilities. The Rasch person-item map demonstrates that the field-test version of the VA LV VFQ-48 has good range and is well centered with respect to the person measure distribution. Construct validity and reliability are also demonstrated.

Original languageEnglish (US)
Pages (from-to)233-241
Number of pages9
JournalJournal of Rehabilitation Research and Development
Issue number2
StatePublished - Mar 2004
Externally publishedYes


  • Low-vision
  • Outcomes measurement
  • Rasch analysis
  • Rehabilitation

ASJC Scopus subject areas

  • Rehabilitation


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