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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
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
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
sb iv psychometrics cont
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
sb iv administration
SB IV Administration
  • Adaptive testing: testing tailored to individual test taker
  • Use of Vocabulary as “Routing” test
  • Basal & Ceiling
evaluation
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
wechsler scales
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”?
wais iii
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?
wisc iii
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
wppsi r
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