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.

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.

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.

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.

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 Comp NV/Visualization• Vocabulary Pattern Analysis• Comprehension Copying• Absurdities Bead Memory• Memory for Sent Quantitative

Stanford-Binet 5th 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).

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+)

S-B V (continued)

• Validity• Five Factors Emerged

• (Principal Components; Varimax rotation)• Fluid Reasoning• Knowledge• Quantitative Reasoning• Visual-Spatial Processing• Working Memory

Overview of S-B V(continued)

• Validity • Good concurrent validity

with:• WPPSI-R (.83)• WISC-III (.84)• WAIS-III (.82)

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