Why was Information chosen as a core subtest over Comprehension?
A number of factors were considered when making this decision. Information psychometric properties such as reliability, subtest floor, gradient, and ceiling, were considered and the correlation between WISC–IV UK and WAIS–IV UK composites had an edge over Comprehension. User-friendliness factors, such as administration time and ease of recording and scoring, clearly supported Information. The performance of different demographic groups was examined statistically, and results indicated smaller differences between racial/ethnic group performance and smaller differences based on level of education on Information, rather than Comprehension. At the subtest level, Comprehension was more sensitive than Information for a number of clinical groups; however, selecting Comprehension as a core subtest did not improve the clinical sensitivity of the VCI or the FSIQ for those groups. With respect to construct coverage, the specificity (unique contribution to the battery) of Information was higher th
