Two methods of estimating the general factor (g) in the WISC-R were compared, using the standardization data for the scale. Estimates of the mean g-loading across subtests and age groups were .63 for one method and .59 for the other. Although this difference was statistically significant, the two methods appear to provide closely comparable results. When corrected for attenuation, means increased to .71 and .67, respectively, but the subtest loadings did not become more homogeneous nor did their relative sizes change appreciably.
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