Flynn used data covering 1932 to 1972 to put U.S. gains at about 0.300 IQ points per year. For post-1972, comparison of WISC–R versus WISC–III, particularly the data of Zimmerman and Woo-Sam, gives a rate of 0.312. However, comparison of WAIS–R versus WAIS–III shows that the current rate may be as low as 0 171 It is hypothesized that the discrepancy may be due to sampling error and it is suggested that post-1972 US gains be put at about 0.25 points per year.
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