Originally Posted by geofizz
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 case are a fruitless endeavor.

Not a random number generator. Regression & curve smoothing. But still with little relationship to real-world instructional levels. Which is why the APA and NASP specifically dis-recommend the use of grade equivalents in assessment reporting and interpretation.

...pronounced like the long vowel and first letter of the alphabet...