File:SpearmanFactors.png

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Description

Illustration of Spearman's two-factor intelligence theory.

I, Schaefer, made this image in Photoshop, based on a similar illustration appearing on page 214 of en:Arthur Jensen's Bias in Mental Testing. The small ovals represent tests of cognitive ability, while the red circle represents psychometric g. The blue portions of each test show the amount of test variance attributed to s, or the specific test factor, by en:Charles Spearman in his two-factor theory of cognitive abilities. The purple areas show the amount of test variance attributed to g. An ideal IQ test would be entirely purple, with no blue. If a test were to be entirely blue, with no purple, it might have measured some other mental aspect (e.g., personality or sensory abilities) but would be unrelated to general intelligence.

This model of intelligence is no longer used by psychometricians as it ignores group factors in test scores. This chart should be of purely historical interest.
Date 29 December 2004 (original upload date)
Source Transferred from en.wikipedia to Commons.
Author The original uploader was Schaefer at English Wikipedia.

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Original upload log[edit]

The original description page was here. All following user names refer to en.wikipedia.
  • 2004-12-29 22:11 Schaefer 200×200×8 (2621 bytes) Illustration of Spearman's two-factor intelligence theory

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current12:57, 11 January 2007Thumbnail for version as of 12:57, 11 January 2007200 × 200 (3 KB)Vladimir Volokhonsky (talk | contribs){{Information |Description=Illustration of Spearman's two-factor intelligence theory. I, Schaefer, made this image in Photoshop, based on a similar illustration appearing on page 214 of en:Arthur Jensen's ''Bias in Mental Testi

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