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Stanford-Binet IV

Stanford-Binet IV. Description: Point-scale (contrast with age-scale of previous editions) Test composite (M=100, SD=16) 4 areas & scores (M=100, SD=16) 15 subtests (M=50, SD=8). Stanford-Binet IV Psychometrics. Standardization sample 5013 subjects

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Stanford-Binet IV

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  1. Stanford-Binet IV • Description: • Point-scale (contrast with age-scale of previous editions) • Test composite (M=100, SD=16) • 4 areas & scores (M=100, SD=16) • 15 subtests (M=50, SD=8)

  2. Stanford-Binet IV Psychometrics • Standardization sample • 5013 subjects • overrepresentation of upper social class & college-educated parents • Weighted norms • Reliability • Subtests: .80s to .90s range • Internal consistency of Composite: .95 to .99

  3. SB IV Psychometrics (cont.) • Validity • Criterion-related validity: median of .70; ranges from .21 to .90 depending on range of abilities in specific sample and criterion instrument used • Construct: Factor analysis • Support for general ability factor (g) • Verbal ability consistently supported • Other factors not consistently supported at all age levels

  4. SB IV Administration • Adaptive testing: testing tailored to individual test taker • Use of Vocabulary as “Routing” test • Basal & Ceiling

  5. Evaluation • Reliable & valid measure of overall intelligence • Strengths: • Large standardization sample • Efforts to eliminate bias • Weaknesses • Overrepresentation of upper class in norms • Not supported by factor analysis at all ages

  6. Wechsler Scales Through the Years

  7. Wechsler Scales • 3 versions: WAIS III(16-89); WISC III(6-16); WPPSI (3-7) • Commonalities: • Verbal & Performance Scales + Full Scale (M=100, SD=15) • WAIS & WISC also divided into “indices” • V & P scales each made up of subscales (M=10, SD=3) • Most frequently administered IQ tests; “Gold standard”?

  8. WAIS III • Standardization sample: 2450 adults 16-89 divided into 13 age bands • 1995 census data: age, sex, race/ethnicity, educational level, geographic region • How many factors do the Wechsler scales measure? • V & P plus four indices • Are they valid?

  9. WAIS III Indices

  10. WISC III • Standardization sample: 2200 kids 6-16 • 1988 census race/ethnicity, region of country, parental ed. Level • Additional testing of African-American & Hispanic kids to limit bias • Several validity studies

  11. WPPSI-R • Standardization sample: 1700 children in 8 age groups (1/2 year intervals) between 3 years and 7 years & one age group 7-0 through 7-3 • Based on 1986 census estimates • Generally considered to be reliable and valid • V & FS from preschoolers predictors of 1st grade achievement, PIQ did not predict achievement

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