Validities of abbreviated WAIS scales.

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Abstract
The validities of all possible abbreviated WAIS scales of two, three, four, and five subtests were determined in this investigation." Among the conclusions based on this study were the following: "The accuracy of an abbreviated scale in estimating Full-Scale Score in-creases as the number of subtests in the scale increases. An optimum point is reached, however, at which an increase in scale length brings about but a slight increase in r. Combinations composed exclusively of verbal tests or of performance tests have lower correlations than do abbreviated scales with both types of subtests. Short verbal scales are superior to the performance scales in estimating mental level as measured by the whole scale." The decreased accuracy in reporting on the mental level of a subject, as well as the loss of qualitative observations during the complete testing, are factors which must be considered before an abbreviated scale is used. 19 references.

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