I have long complained that making custom composite scores should not be difficult. The ability to combine scores as one wishes should be a feature of every scoring program for every cognitive battery.
No matter which tests I have given, I would like to be able to combine them into theoretically valid composite scores. For example, on the WISC-V, the Verbal Comprehension Index (VCI) consists of two subtest scores, Vocabulary and Similarities. However, the Information and Comprehension subtests measure verbal knowledge just as well as the other two tests. We should be able to combine them with the two VCI subtests to make a more valid estimate of verbal knowledge.
The good news is that the WISC-V now allows us to do just that: It now has two expanded composite scores:
- Verbal Expanded Crystallized Index (VECI)
- Expanded Fluid Index (EFI)
- Matrix Reasoning
- Picture Concepts
- Figure Weights
At the risk of sounding greedy, I would like to have an expanded working memory index (Digit Span, Picture Span, and Letter-Number Sequencing) and an expanded processing speed index (Coding, Symbol Search, and Cancellation). Even so, I am grateful for this improvement in the WISC-V.