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Stability, concurrent and predictive validity of the PPVT-R.

J A Naglieri, S I Pfeiffer

Journal of Clinical Psychology

|November 1, 1983

Summary

The Peabody Picture Vocabulary Test-Revised (PPVT-R) shows moderate correlations with the Peabody Individual Achievement Test (PIAT) in children with intellectual disabilities. The PPVT-R demonstrated good stability and validity for this population.

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Area of Science:

Psychometrics
Developmental Psychology
Special Education

Background:

The Peabody Picture Vocabulary Test-Revised (PPVT-R) is a widely used measure of receptive vocabulary.
Understanding the psychometric properties of the PPVT-R, including its validity and stability, is crucial for its appropriate application in clinical and research settings.
Previous research has explored the PPVT-R's relationship with other achievement measures, but specific data for children with intellectual disabilities are valuable.

Purpose of the Study:

To investigate the concurrent and predictive validity of the Peabody Picture Vocabulary Test-Revised (PPVT-R).
To examine the stability of PPVT-R scores over a 7-month period in children with intellectual disabilities.
To explore the relationship between PPVT-R scores and scores on the Peabody Individual Achievement Test (PIAT) in this population.

Main Methods:

A sample of 29 children with intellectual disabilities, aged 5-5 to 12-7, participated in the study.
Participants completed the PPVT-R at two time points approximately 7 months apart.
The PPVT-R and PIAT were administered during the same session to assess concurrent validity.

Main Results:

Pretest PPVT-R scores showed moderate correlations with PIAT standard scores (Median r = .43) and high correlations with posttest PPVT-R scores (r = .81).
No significant difference was found between mean PPVT-R pretest (60.3) and posttest (58.5) scores, indicating stability.
The PPVT-R and PIAT Total Test Score administered concurrently correlated at .71 (Median r with PIAT subtests = .64).

Conclusions:

The PPVT-R demonstrates good stability over a 7-month period in children with intellectual disabilities.
The findings support the concurrent and predictive validity of the PPVT-R for assessing receptive vocabulary in this population.
The PPVT-R can be considered a reliable measure for use with children with intellectual disabilities, correlating well with broader academic achievement.

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