For IQ, none of the original WISC-IV sample scored above 150 for full scale. I understood this to mean that there was a lot of extrapolation and guessing in determining the raw score differences that would give 150, 155, or 160 for full IQ.
Really?
160 is the ceiling for the WISC IV. What I don't understand is how the extended norms work. Our tester said there are no further questions for the extended norms, it's just a comparison with a different sample with a score supposedly going up to 210. But a score in the 150s represents so many maxed out subtests already that I don't understand how they can distinguish that much over that. I'd love to hear an explanation from people who really understand it.
