Validating scales and indexes

They are also used to study distributions of psychometric intelligence in populations and the correlations between it and other variables.Raw scores on IQ tests for many populations have been rising at an average rate that scales to three IQ points per decade since the early 20th century, a phenomenon called the Flynn effect.It was intended to identify mental retardation in school children, The score on the Binet-Simon scale would reveal the child's mental age.For example, a six-year-old child who passed all the tasks usually passed by six-year-olds—but nothing beyond—would have a mental age that matched his chronological age, 6.0. Binet thought that intelligence was multifaceted, but came under the control of practical judgment. American psychologist Lewis Terman at Stanford University revised the Binet-Simon scale, which resulted in the Stanford-Binet Intelligence Scales (1916).He suggested that all mental performance could be conceptualized in terms of a single general ability factor and a large number of narrow task-specific ability factors.Spearman named it g for "general factor" and labeled the specific factors or abilities for specific tasks s.

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Typically, the "g-loaded" composite score of an IQ test battery appears to involve a common strength in abstract reasoning across the test's item content.An intelligence quotient (IQ) is a total score derived from several standardized tests designed to assess human intelligence.The abbreviation "IQ" was coined by the psychologist William Stern for the German term Intelligenzquotient, his term for a scoring method for intelligence tests at University of Breslau he advocated in a 1912 book.Some psychometricians regard g as a statistical artifact.During World War I, a way was needed to evaluate and assign Army recruits to appropriate tasks.