The
Hoagie's Gifted page that attempts to quantify levels of giftedness defines "highly gifted" as 145+, and "profoundly gifted" as 152+, 175+, or 180+ depending on the instrument used to test. (It does not include the WISC-V, the most recent test edition, in its definitions.) Davidson, on the other hand, defines "profoundly gifted" as starting at 145. I think that George is correct in stating that Hoagie's and Davidson are using these words differently, and that "Davidson PG" is roughly the same as "Hoagie's HG".
To clarify, Hoagies webpage summarizes the approximate equivalent test scores. These are overall test scores, Full Scale IQs, not individual subtests nor GAIs. Various tests have different scores corresponding to 3SD+ from the norm, 99.9th percentile.
The roughly equivalent scores for Profoundly Gifted, depending upon test instrument, are given as: 152-160, 175+,
145++, 180. (You omitted reporting the 145++, appearing to cherry-pick data to make a point.)
One ought not to conflate scores from different tests, as the levels of gifted (LOG) are distinct and represent progressively higher scores.
On Hoagies the
gifted ranges are described as:
1) Gifted (G) or Moderately Gifted (MG)
2) Highly Gifted (HG)
3) Exceptionally Gifted (EG)
4) Profoundly Gifted (PG)
<== defined by DITD: 3SD+, 99.9th percentile, minimum 145.HG is not synonymous with PG.
HG+ is not synonymous with PG.
HG+ would include those who are Highly Gifted, Exceptionally Gifted, and Profoundly Gifted.
