An overview and review of the differential ability scales: Initial and current research findings
1991; Elsevier BV; Volume: 29; Issue: 3 Linguagem: Inglês
10.1016/0022-4405(91)90008-f
ISSN1873-3506
AutoresLeslie Oliver Platt, Randy W. Kamphaus, Joan Keltgen, Fran Gilliland,
Tópico(s)Psychometric Methodologies and Testing
ResumoThe Differential Ability Scales (DAS) is one of the latest entries into the field of intelligence tests. Colin Elliot and the other developers of the DAS used the most current statistical procedures in an attempt to create a test that is psychometrically sound. They also sought to design subtests that measure a variety of separate and distinct areas of cognitive functioning. This article provides an overview of the instrument and a review of initial and current research. This research suggests that the developers of the DAS have succeeded in designing an instrument that has strong psychometric properties. There is, however, some concern about whether the subtests can be individually interpreted and about whether the factor structure will stand up to further research and clinical use. The use of current statistical procedures has given the DAS some improvements over other intelligence tests. The use of factor analysis enabled the DAS developers to include in the overall standard score only those subtests with high g loadings. The use of the Rasch model also allowed the DAS developers to incorporate adaptive testing for more efficient assessment. The development of extended norms allows the calculation of overall standard scores as low as 25, lower than other intelligence tests. The DAS appears to have promise as a useful addition to the field of intelligence testing and seems to be worthy of at least trial clinical and research use.
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