I concur with Rich. IQ is a norm-referenced test. It is restandardized periodically to make the comparison to the current average. Over time, if the standardization is not too out of date, roughly half the kids are over 100 in each period. To be in the middle now requires getting more answers correct than it used to.
I guess it comes back to the original question on data transformation. The raw number of items correct doesn't have much meaning at a given time except in comparison to the current cohort of kids. Art [EMAIL PROTECTED] . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
