Possible Sampling Bias in Genetic Studies of Genius

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Abstract
The data from Terman's Genetic Studies of Genius (1925-1959) relating to sample size, mean IQ, and variance of IQ scores were analyzed in terms of their conformation to the theoretically projected statistics derived from a consideration of the normal curve. Deviations from the theoretical projections lead to the probable conclusion that the sample size was too small, with the IQ scores clustered more closely about a significantly higher mean than projected. Although the major findings of the "Genius" study are not cast into doubt by this analysis, caution is urged with respect to comparisons to a normal sample when the differences are not large.

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