Cancellation has a high factor loading on PSI. Why was Cancellation not included as a core subtest?
Factor loadings are one of the criteria considered when deciding which subtests are core and which are supplemental. Although Cancellation shows preliminary evidence of clinical utility in terms of the difference in performance between the structured and random presentations, it correlates lower with FSIQ than the subtests that were included as core subtests, and would involve the purchase of an additional response booklet for every administration.
