1. History of Stanford-Binet  Binet-Simon scale of 1905.  30 items designed to measure judgment, comprehension, and reasoning which Binet deemed the key characteristics of intelligence.  Heavily verbally weighted.  Standardized by administering to 50 normal children and some retarded children and adults.

2. History of S-B (continued)  1908 scale- Greater standardization sample (n = 300; 3-13).  Tests grouped into age levels on the basis of performance.  Mental level (later mental age) = score on the test. A child's mental level corresponded to the age of normal children whose score the child equaled.  1911 scale- Tests added at the adult level.  Binet died in 1911.

3. History of S-B (continued) 1916- Test restandardized with 1000 children & 400 adults. 1937 – Two equivalent versions of the test were created (forms L & M). 3,200 were used in standardization from 1.5 to 18 yrs. 1960 – Best items of forms L & M were combined. Standardization (N = 4,500) with age 2.5 to 18 yrs. 1972 – Standardized (N = 2,100) using stratified random sample; ages 2 to 18.

4. History of S-B (continued) 1986 (SBIV) - Standardization - N= 5,000. Ages 2 to 23; 47 states and DC. Composite Score – All subtests correlated with CS (Big G) ranging from.8 (Vocabulary) to.54 (Memory for Objects) For ages 2-6: Verbal Comprehension & Nonverbal Reasoning/Visualization Factors emerged. For ages 7-23:VC, NR/V, & Memory were factors The Vocabulary Subtest serves as a Routing Subtest. Only certain subtests are given at certain ages.

5. Properties of S-B Composite Score (Mean = 100; SD = 16) Area Scores (Mean = 100; SD = 16) Subtest (Mean = 50; SD = 8) 2 Factors for Children (2-6) Verbal CompNV/Visualization VocabularyPattern Analysis ComprehensionCopying AbsurditiesBead Memory Memory for SentQuantitative

6. Stanford-Binet 5 th Edition (2003) Standardization- 4,800 individuals from aged 2 to 85+. 10 subtests. Typically takes 45 to 75 minutes for full test. Uses two routing subtests, verbal (vocabulary) and nonverbal (object series/matrices). Used 2000 U.S. Census (variables = geographic region, socioeconomic levels, and ethnicity).

7. Overview of S-B V Reliability K-R =.97 to.98 (Full Scale), Similar for 5 Factor Scores (.90 and higher); Individual subtests (.84 and higher). SEM = < 3 points for Composite score. 3 to 6 points for Factor scores. Test-retest reliability =.92 for Full Scale for 4 age groups (2-5; 6-20; 21 &.90 to 59; 60+)

8. S-B V (continued) Validity Five Factors Emerged (Principal Components; Varimax rotation) Fluid Reasoning Knowledge Quantitative Reasoning Visual-Spatial Processing Working Memory

9. Overview of S-B V (continued) Validity Good concurrent validity with: WPPSI-R (.83) WISC-III (.84) WAIS-III (.82)

10. Classifications from IQ Tests Stanford-Binet Very gifted 145+ Gifted 130-144 Superior 120-129 High Average 110-119 Average 90-109 Low Avg. 80-89 Borderline impaired 70-79 Mild MR 55-69 Moderate MR 40-54 Wechsler Tests Very Superior >130 Superior 120-129 High Avg 110-119 Average 90-109 Low Avg 80-89 Borderline 70-79 MR <70