An evaluation of the validity of the Test of Visual Perceptual Skills - Revised (TVPS-R) using the Rasch Measurement Model

Brown, T. and Rodger, S. (2009) An evaluation of the validity of the Test of Visual Perceptual Skills - Revised (TVPS-R) using the Rasch Measurement Model. British Journal of Occupational Therapy, 72 2: 65-76. doi:10.1177/030802260907200204


Author Brown, T.
Rodger, S.
Title An evaluation of the validity of the Test of Visual Perceptual Skills - Revised (TVPS-R) using the Rasch Measurement Model
Journal name British Journal of Occupational Therapy   Check publisher's open access policy
ISSN 0308-0226
1477-6006
Publication date 2009-01-01
Sub-type Article (original research)
DOI 10.1177/030802260907200204
Open Access Status Not yet assessed
Volume 72
Issue 2
Start page 65
End page 76
Total pages 12
Editor Barnett, U.
Place of publication United Kingdom
Publisher College of Occupational Therapists Ltd.
Language eng
Subject C1
920201 Allied Health Therapies (excl. Mental Health Services)
110321 Rehabilitation and Therapy (excl. Physiotherapy)
Abstract The visual perceptual skills of children are often evaluated by health care and education practitioners. Even though the Test of Visual Perceptual Skills - Revised (TVPS-R) is one of the most frequently used instruments with school-age children, its construct validity has not been evaluated thoroughly. The purpose of the study was to evaluate the scalability/interval level measurement, unidimensionality, lack of differential item functioning (DIF), and hierarchical ordering of items of the TVPS-R and its seven subscales using the Rasch Measurement Model (RMM). The TVPS-R scores from a sample of 356 normally developing children (171 boys and 185 girls), ranging in age from 5 to 11 years, were used to complete the RMM analysis. When the seven individual TVPS-R scales were analysed, they all exhibited adequate measurement properties (scalability/interval level measurement, unidimensionality, lack of DIF, and hierarchical ordering). However, when they were collapsed together to form an overall composite scale of motor-free visual perceptual skills, the TVPS-R items failed to group together to measure a unidimensional construct. In addition, many scale items exhibited RMM misfit or DIF. The results suggest that the seven TVPS-R subscales can be used on an individual basis with clients to generate a profile of their motor-free visual perceptual skills, but that they cannot be summed together to calculate an overall summary motor-free visual perceptual score or perceptual quotient. The TVPS-R composite scale does not exhibit adequate construct validity.
Keyword Assessment
Children
Testing
Validity
Visual perception
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Health and Rehabilitation Sciences Publications
 
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Created: Wed, 27 May 2009, 22:02:28 EST by Meredith Downes on behalf of School of Health & Rehabilitation Sciences