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]
(psychology)
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 ?
In this current study, silencing of the gene was associated with lower IQ test results.
But if he did say that, I guess we'll have to compare IQ tests. And I can tell you who is going to win," Trump told Forbes magazine in reference to reports of Tillerson calling him a moron.
The Grade 6 student scored 99 plus in Mensa's IQ test. This was especially creditable, as her father had died at a construction site just two months before her test.
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He cites the Dutch scholar Jelte Wicherts when discussing 'factorial invariance' of IQ tests. Flynn explains that this term refers to the way in which the three main forms of intelligence (verbal, non-verbal, spatial) have not risen at similar rates, as spatial (shapes) has risen much faster.
Psychiatrists and psychologists who are supporting Hall also say that an IQ test alone is insufficient for a diagnosis of mental disability.
A TEENAGER has scored 162 in an IQ test - higher than Stephen Hawking, Albert Einstein and Bill Gates.
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Carter, an IQ test specialist and author of books on testing, and Russell, also an author of books on testing, present 1,000 practice questions with answers for those preparing for IQ tests in job recruitment and selection, organized into 25 tests.
RATE your intelligence with an IQ test in Newcastle.
A MENSA IQ test session will be held in Coventry next month.
For a period of 20 years, a total of 2500 Bulgarians have passed the IQ test with an appropriate score.