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Psychometrics & IQ Wiki

A community-sourced wiki dedicated to offering a comprehensive understanding of the science of human intelligence.

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Recently Updated Articles

IQ Differences Between Men and Women

Updated 6 days ago

Evidence on IQ differences between men and women, including variability, spatial ability, and biological and socio-cultural factors.

Old SAT and IQ

Updated 1 week ago

Research on the pre-1994 SAT as a measure of general intelligence (g), including correlations with IQ tests, coaching effects, and historical design. Also explores national averages and declines, controversy, test validity, bias, and mean major scores.

Glossary

Updated 2 weeks ago

A beginner-friendly glossary of core statistics and concepts used in psychometrics and IQ testing.

General Intelligence (g Factor)

Updated 3 weeks ago

Explains the g factor (general intelligence): how it emerges from shared variance across cognitive tests, its hierarchical structure, g-loadings, what g is and is not, and why it predicts learning, job performance, and other real-world outcomes.