WAIS-III AND WISC-III IQ GAINS IN THE UNITED-STATES FROM 1972 TO 1995- HOW TO COMPENSATE FOR OBSOLETE NORMS

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-I II, 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 curr ent rate may be as low as 0.171. It is hypothesized that the discrepan cy may be due to sampling error and it is suggested that post-1972 US gains be put at about 0.25 points per year.