I've posted this link before:
http://www.assess.nelson.com/pdf/sb5-asb3.pdf

On pp. 7-8 are some rough equivalencies reported by Dr. Ruf for the SB5 and SB L-M, the latter of which if I'm not mistaken used ratio scores.

It does seem like being 4.5 years ahead at age 10 is possibly in territory justifying radicalish acceleration, and on that basis the numbers might not be so far distant. I'm interested too.

Striving to increase my rate of flow, and fight forum gloopiness. sick