In my kids, IQ and grade level equivalents have no relationship, while the scaled scores of index scores correlate with one another, at least within a standard deviation or so. Grade level equivalents appear to be produced by a random number generator.

Attempting to make correlations with grade level equivalents in our family's case of high IQ and achievement are a fruitless endeavor, as they seem to be the poster children for "asynchronous development," paired with variable rates of average development in different skills.

Last edited by geofizz; 12/22/14 10:58 AM.