Thanks for the response, Aeh! Very interesting reads. It'd be interesting to see a breakdown of the increase by index and subtest for children who reached the ceiling for that index in particular, knowing that each child hit different ceilings on the test.
As for composite scores, it makes a lot of sense that they'd be more extreme than the averages when combining the distributions. I'd be interested to know if different subtests for the same broad skill differentiate more with respect to different areas of the skill (like activating different fibers in the same muscle) or if the different formats are there to reduce the advantages or disadvantages an individual may have with one format alone.
