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August 18, 2004

Flynn Effect my a$$

New ACT data out. Surprise, surprise regarding rank order, etc.

What is interesting is the stability of the mean score.

If you look at a little longer time period, the stability of mean scores is uncanny1:

National Average ACT Composite Score, 19942004
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
20.8 20.8 20.9 21.0 21.0 21.0 21.0 21.0 20.8 20.8 20.9

Now, we know the SAT is highly g-loaded, and the ACT cannot be too far behind (see how high they correlate). So, combine this with J. P. Rushton's work, and I pose to you that the Flynn Effect is just psychometric slight-of-hand, i.e., while IQ scores appear to the naked eye to be going up, mean "intelligence" is rather steady.

1. The rescaling was in the early 1990s, and I do not believe that any of the scores were computed under the old scaling.

Posted by A. Beaujean at 09:47 PM