How can standard scores be generated for raw scores of 0 on the WIAT-IIUK subtests? How does this affect the Composite score?
The reason for providing standard scores for raw scores of 0 are to provide anchor points for the distribution. As for composite scores, it is extremely rare that a student would score 0 on all the subtests that comprise the composite score. Also, keep in mind that the composite scores are calculated based upon the sum of the subtest standard scores that make up the composite. With the exception of Pseudoword Decoding for the very young student, there is sufficient floor in all of the subtests where a raw score of 0 is reflected by a low standard score.
