With less than 0.03% hitting the high score and less than 0.2% being within 50 points of the high score, from the latest detailed data released by College Board, I don't think it's a low ceiling. This isn't an instrument to differentiate among PG students, it's applied to the entire population.

0.03% is about 3.44SD, or an IQ of 152 on a 15 point SD. I'm sure many of the tools we discuss have ceilings in the 150 range.

Last edited by Cranberry; 12/09/18 06:48 PM.