Psychometric Properties
The US standardisation of the WPPSI-III included 1,700 children aged 2 years 6 months – 7 years 3 months. The reliability coefficients for the WPPSI-III US composite scales range from .89 to .95. The UK sample for the WPPSI-III was collected between 2002–2003 and contained 805 children in an attempt to accurately represent the most current UK population of children aged 2 years 6 months to 7 years 3 months according to the 2001 UK census data. The UK validation project was conducted at City University under the direction of Professor John Rust.
The WPPSI-III has been formally linked with the WIAT-II. (The Psychological Corporation, 2001). The relationship between the WPPSI-III and the WPPSI-R, WISC-III, BSID-II, DAS, WIAT-II and CMS was also explored in order to evaluate the assessment’s reliability. A number of special group studies were also carried out during standardisation in order to improve the clinical utility of the tool. These studies included children with mental retardation, developmental delay, language disorders, motor impairment, ADHD and those classed as gifted.
Read more about this topic: Wechsler Preschool And Primary Scale Of Intelligence
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