Abstract
THE fundamental reason why general intelligence cannot be measured exactly by a hierarchical set of tests even if we agree that they define it (unless one of them tests nothing but general intelligence) is that in such a set there is always one more Spearman factor than the number of tests: for each test has its own specific factor, and in addition there is the general factor.
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THOMSON, G. Definition and Measurement of General Intelligence. Nature 135, 509 (1935). https://doi.org/10.1038/135509b0
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DOI: https://doi.org/10.1038/135509b0
