Examining the Factor Structure and Psychometric Properties of the Test of Visual-Perceptual Skills

This study examines psychometric properties and factor structure of the Test of Visual-Perceptual Skills (nonmotor) (TVPS), a measure developed to assess children with school-related learning difficulties. Following a descriptive retrospective study design, clinic record data were compiled for a convenience sample of 294 children. While measure use was generally supported, findings indicate areas wherein the measure lacks psychometric soundness. Item analysis using point biserial correlations showed a low relationship between some items and subscale scores. Coefficient alpha showed acceptable internal consistency for group totals by subscale but only 3 of 7 by age group. Correlations between TVPS scores and criterion variables followed the pattern expected of a measure of visual perception. Confirmatory factor analysis did not support use of a unitary TVPS PQ score. Exploratory factor analysis supported some, albeit not all of the subscales, as measuring distinct visual-perceptual skills.