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An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.
The test is currently in its second edition, published in 2015. [2]Both editions are suitable for evaluation of intellectual giftedness, [3] and high scores are accepted as qualifying evidence for high IQ societies such as Intertel (min. IQ ≥ 135) and American Mensa (min. IQ ≥ 130).
A Perceptual Reasoning Index (PRI) can be derived from the raw scores on the Matrix Reasoning and Block Design subtests. A Full Scale IQ-2 (FSIQ-2) can be derived from the raw scores on the Matrix Reasoning and Vocabulary subtests, while a Full Scale IQ-4 (FSIQ-4) can be derived from the raw scores on all 4 subtests. WASI-II Subtests grouped by ...
IQ scores can differ to some degree for the same person on different IQ tests, so a person does not always belong to the same IQ score range each time the person is tested (IQ score table data and pupil pseudonyms adapted from description of KABC-II norming study cited in Kaufman 2009).
The popular shortening of IQ tests, especially those intended for children, is primarily due to the increasingly heavy workloads of school psychologists. Experts have historically argued that these shorter tests are less accurate. The WRIT is an attempt to optimize accuracy in a short-form IQ test that includes fewer subtests. [5]
Terman and Merrill attempted to calculate IQs with a uniform standard deviation while still maintaining the use of the mental age scale by including a formula in the manual to convert the ratio IQs with means varying between age ranges and nonuniform standard deviations to IQs with a mean of 100 and a uniform standard deviation of 16.