In choosing appropriate education, it is often needed to compare the ability of a highly gifted child of a younger age with a moderately gifted class of an older age. Before now, this has been basically guesswork.

I have found a better approximation: convert a given IQ at a given age to an absolute measure of intelligence, the Stanford-Binet 5 CSS score or the identical Woodcock-Johnson III or IV W-score, then convert that score back to an IQ score for a given age (or an age for a given IQ score).

Here's my blog post: Converting IQ at a Given Age to an Absoloute (Rasch) Measure of Intelligence .

Here's the graph that lets you do it:

[Linked Image from 2.bp.blogspot.com]
(which may not work, it's also at the top of the blog post)

Last edited by Enon; 03/28/16 02:24 PM. Reason: icon change
"Reeling and Writhing, of course, to begin with," the Mock Turtle replied...-- Lewis Carroll