So this is Deborah Ruf's article on the SB5's extended norms, written under the auspices of the publisher.

SB5 ASB3

This is Linda Silverman's definitions of LOG. She collected data for, and helped to develop, the WISC-IV and -V extended norms:

GDC HG/PG

They are both referring to deviation IQs (contemporary test design, not the ratio IQ of SBLM days), and use essentially the same 1 SD brackets for each tier of GT-ness, with +2SD G/MG, +3SD HG (highly), +4SD EG (exceptionally or extremely), +5SD PG (profoundly). Ruf also includes an approximate concordance table for SBLM to SB5 comparisons.

Last edited by aeh; 02/15/20 09:33 PM.
...pronounced like the long vowel and first letter of the alphabet...