In statistics, Spearman developed rank correlation (1904), a non-parametric version of the conventional Pearson correlation, as well as both the widely used correction for attenuation (1907), and the earliest version of a 'factor analysis (Lovie & Lovie, 1996, p. 81)
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A record of Spearman's views on g (and also those of Godfrey Thomson and Edward Thorndike) was made in the course of the Carnegie-sponsored International Examinations Inquiry Meetings.
Aveling worked at University College, London from 1912 as a lecturer, under the leadership of Charles Spearman, until the First World War.
This supported a literal 'mental energy' model of intelligence, first postulated by Charles Spearman.
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During World War I he worked with the United States Army to develop psychological tests to screen new draftees while studying under Charles Spearman and Karl Pearson.