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Published online by Cambridge University Press: 05 November 2012
Box 13 in Chapter 4 gives estimates for American IQ gains for 14 periods all post-1972. It is derived from Table AII1.
This table is useful for analyzing whether the norms of a given test seem eccentric. For example, if a test has substandard norms, it will inflate estimates when paired with a later test and deflate estimates when paired with an earlier test.
Use the Ideal vs. real column to assess the WAIS-III: (1) it is paired with a later test in (1), (3), and (7) and these show deviations of 3.70, 1.07, and 0.07 toward too many points gained; (2) it is paired with an earlier test in (9) and (14) and these show deviations of 0.90 and 2.50 toward too few points gained; (3) the sum of the deviations is 8.24 and divided by 5 equals 1.65, as the number of points by which the WAIS-III inflated IQ scores even at the time it was standardized .
Box 15 in Chapter 4 gives American IQ gains for both the WISC and WAIS from one standardization sample to the next. It is derived from Tables AII2 and AII3.
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