intelligence quotient

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intelligence quotient

a measure of the intelligence of an individual derived from results obtained from specially designed tests. The quotient is traditionally derived by dividing an individual's mental age by his chronological age and multiplying the result by 100

intelligence quotient (IQ)

a unit used in the field of INTELLIGENCE measurement and testing as an index of an individual's intelligence relative to a comparable population with respect to age. A ratio IQ is the IQ expressed as a ratio of mental age (as measured by a test) to chronological age, and multiplied by 100 to avoid decimals:

The average child at any one chronological age will therefore score 100 on the appropriate set of IQ test items. This was the original IQ measure first used in 1916 in the Stanford-Binet Test.

Modern tests make use of standard scores, which express the individual's distance from the mean in terms of the standard deviation, and assume a normal distribution. In a variant of this, the deviation IQ, the mean is 100 and a standard deviation of 15 or 16 is usual.

It is important to note the difference between these measures, since the deviation IQ is not a ratio of mental age to chronological age, and the measured IQs derived from it will depend on the standard deviation used in the test. see also INTELLIGENCE TEST.

intelligence quotient

[in′tel·ə·jəns ‚kwōsh·ənt]
The numerical designation for intelligence expressed as a ratio of an individual's performance on a standardized test to the average performance according to age. Abbreviated IQ.
References in periodicals archive ?
But if he did say that, I guess we'll have to compare IQ tests.
Judge Peckham granted the plaintiff's motion for a preliminary injunction that enjoined the use of any standardized IQ tests for the identification of Black EMR children or their placement into EMR classes without receiving prior approval of the court.
1992) The Minnesota trans-racial adoption study: A follow-up of IQ test performance at adolescence.
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Chris Tyler, Chairman of British Mensa, said: "There are a variety of reasons why people take the IQ test, whether it is simply curiosity or as a challenge, but many people are pleasantly surprised by their IQ score.
Chris Tyler, British Mensa's chairman, said: "There are a variety of reasons why people take the IQ test, whether it is simply curiosity or as a challenge, but many are pleasantly surprised by their IQ score.
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But recent gap narrowing is shown by only a single IQ test.
Results from the file verification spreadsheet can be copied and pasted directly into the IQ test script file verification table.