Abstract
IT is well-known that Spearman's two-factor theory of intelligence leads to an expression for the general factor g containing an indeterminate part1. Considerable discussion has taken place on the inconvenience so caused. I have proved that if we adhere strictly to the conditions laid down by Spearman, namely, that the general factor and the specific factors are all mutually uncorrelated, we cannot dispense with the indeterminate part2.
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References
Brit. J. Psychol., 24, 88; 1933.
Lecture to Manchester Mathematical Society, Feb. 14, 1934 (unpublished).
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PIAGGIO, H. Spearman's General Factor without the Indeterminate Part. Nature 133, 836 (1934). https://doi.org/10.1038/133836b0
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DOI: https://doi.org/10.1038/133836b0
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