Stanford-Binet Intelligence Scale: 5th Edition (SB5)
 

Purpose: Designed for the testing of cognitive abilities.

Population: Individuals ages 2 through 85+ years.

Score: Verbal, Performance, and Full Scale Scores.

Time: Varies depending on age and functional level of examinee.  Most items are untimed adding to the overall time for administration.

Author: Gale H. Roid.

Publisher: Riverside Publishing.

Description: This fifth edition blends features of earlier editions of the SB with recent improvements in psychometric design. Point-scale format subtests, designed to measure behavior at every age, and used in the 1986 edition are combined with the age-scale or functional-level design of the earlier editions (1916-1937). Two routing subtests identify the developmental starting points of the examinee, and the items can be tailored to cognitive level, resulting in greater precision in measurement. The fifth edition maintains many of the same subtests and items of previous editions, and includes a global g factor and several broad factors at the second level as in the Stanford-Binet Fourth Edition (SB: FE).  Changes in the SB5 distinguishing it from the SB: FE, include some modernization of both artwork and content and some additions and enhancement of content.  The SB5 now has five factors, (Fluid Reasoning, Knowledge, Quantitative Reasoning, Visual-Spatial Processing, and Working Memory) as opposed to the four of the SB: FE.  Many toys and objects have been returned from earlier editions, as they are helpful with early childhood assessment. Unique to the SB5 is the use of a nonverbal mode of testing covering all five cognitive factors. The range of the scales has been extended to more accurately measure both higher and lower areas of functioning.  Changes in the Item and Record Forms are reported to have made the scale more useful for clinical, forensic, school and vocational applications and interpretations.  This edition also allows for evaluation of the abilities of elderly examinees.

Scoring: Raw scores are converted into scaled scores (M = 10, SD = 3) using age appropriate tables. The scaled scores are summed for Nonverbal, Verbal and Full Scale IQ as well as for the five factor index scores.  These are all normalized standard scores (M = 100, SD = 15).  Percentile rank equivalent and the confidence intervals are also obtained.  Computerized scoring is faster, provides greater consistency of raw score conversion and is recommended for use whenever available.

Reliability: Using the split half method, and correcting with the Spearman-Brown formula, reliability coefficients were extremely high for the Full Scale Score (.98).  The Nonverbal (.95) and Verbal (.96), showed excellent stability, and the Abbreviated Battery (.91) is also considered excellent as it contains only two subtests.  The five factor index scores were all above 90, and were higher than the subtest scales, which were however comparable to other cognitive tests with ranges from .84 to .89.

Validity:  As with the SB: FE, several studies were done to investigate the validity of the SB5.  The first such studies explored the relationship between the SB5 and the SB: FE and the Form L-M. There was a high correlation (.90) between the SB5 Full Scale and the SB: FE Composite Scale. The higher scores of the Composite Scale are explained by the differences in the SD used and the countrywide changes in the IQ  (0.3 points per year, as documented by Flynn (1985, 1987). The difference in the Full Scale Score of the SB5 and the one score of the Form L-M was in the direction, but not as great as predicted.  Differences in scoring and nonverbal aspects of the tests, as the Full Scale and Verbal Score correlations are high (.85 and .88). Comparisons were also made with other tests such as the WPPSI-R, the WISC-III, the WAIS-III, and the Woodcock-Johnson III test of Cognitive Ability and W-J III Test of Achievement. Correlations ranged from .78 to .84. for Full Scale or Verbal IQ and comparable scores. This extensive analysis revealed a high correlation between the composite IQ scores of the SB5 and the composite scores of previous SB edition and all of the major IQ batteries used for all populations.

Norms: The standardization consisted of 4,800 subjects ages 2 to 85+.  Care was taken to assure that the sample was as representative of the US population Census 2001.  Stratification variables were age, sex, race / ethnicity, geographic region, and socioeconomic level.

Suggested use:  The SB5 are used in diagnosis of mental retardation, learning disabilities, and developmental cognitive delays in young children and for placement in academic programs for the intellectually gifted.