I can look up the actual critical value when I have my tables in front of me, but I can tell you now that Morcheeba's child's scores exceed it. It doesn't, btw, actually make the GAI invalid; it just makes it not fully representative of the range of that individual's ability.
Pinecroft, if you would like to tell/pm me the PRI/VCI difference in question, and its direction, I can check whether it tips the critical value for you, while I'm at it.
The question of index variation and which indices and composites are the best indicator of cognition is another one of the reasons it's important to have an evaluator who is a skilled clinician, and who will spend time with you explaining test results in the context of the whole child.
