Abstract
IF a number of sufficiently dissimilar mental tests of intellective ability be applied to a group of individuals and correlation coefficients calculated, it is found that these correlation coefficients are related to one another in such a way that for any four (or tetrad) of them the following relation holds good within the limits of random sampling:
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References
Spearman, C. "The Abilities of Man". London, 1927, pp. 74, 75.
Brown, William. "The Essentials of Mental Measurement", First Edition 1911, Cambridge, pp. 114, 116.
Pearson, K. and Moul, M. "The Mathematics of Intelligence, I. The Sampling Errors in the Theory of a Generalized Factor." Biometrika, vol. 19, p. 261, Dec., 1927.
Spearman, C. and Hol&zmacr;inger, K. "The Average Value for the Probable Error of Tetrad Differences", Bra. J. Psychol, vol. 20, part 4, p. 370, April, 1930.
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BROWN, W. Mathematical and Experimental Evidence for the Existence of a Central Intellective Factor. Nature 130, 588–589 (1932). https://doi.org/10.1038/130588a0
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DOI: https://doi.org/10.1038/130588a0
