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The WPPSI–IV provides Verbal and Performance IQ scores as well as a Full Scale IQ score. In addition, the Processing Speed Quotient (known as the Processing Speed Index on previous Wechsler scales ) can be derived for children aged 4 – 7 years 3 months, and a General Language Composite can be determined for children in both age bands (2 ...
The third edition was published in 1991 (WISC-III; Wechsler, 1991) and brought with it a new subtest as a measure of processing speed. In addition to VIQ, PIQ, and FSIQ scores, four new index scores were introduced: the Verbal Comprehension Index (VCI), the Perceptual Organization Index (POI), the Freedom from Distractibility Index (FDI), and ...
In 1958, Wechsler published another edition of his book Measurement and Appraisal of Adult Intelligence. He revised his chapter on the topic of IQ classification and commented that "mental age" scores were not a more valid way to score intelligence tests than IQ scores. [69] He continued to use the same classification terms.
The Performance subtests were: Picture Arrangement, Picture Completion, Block Design, Object Assembly, and Digit Symbol. A verbal IQ, performance IQ and full scale IQ were obtained. [10] This revised edition did not provide new validity data, but used the data from the original WAIS; however new norms were provided, carefully stratified. [10]
Since its inception, the Stanford–Binet has been revised several times. The test is in its fifth edition, called the Stanford–Binet Intelligence Scales, Fifth Edition, or SB5. According to the publisher's website, "The SB5 was normed on a stratified random sample of 4,800 individuals that matches the 2000 U.S. Census".
The British NART was re-standardized in 1991 to enable calculation of predicted IQ on the newer WAIS-R [4] and again in 2016 to provide premorbid estimates on the most recent WAIS-IV. [5] There are two versions of the NART devised for use in North America ; both feature a modified word list and re-standardization of predicted IQ.
Likewise, when a 2011 study was conducted comparing the relationship between test scores using the second and third editions of the Bayley Scales in extremely preterm children, it was concluded that interpreting these scores should be done with caution as the correlation with the previous edition appears worse at lower test score values. [9]
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.