Factor Structure of the Wechsler Intelligence Scale for Children at Pre-School Level and after First Grade: A Longitudinal Analysis

Abstract

In order to determine the changes in mental factor structure with increasing age and educational maturity, two factor analytic studies were made. In 1961, 163 pre-school children were examined with the Wechsler Intelligence Scale for Children and 4 reference tests. One year later this test battery was repeated with 153 of the same children. The 10 standard WISC subtests, except coding, were split into 2, 3, or 4 parts to yield as many variables as possible. Kaiser's varimax rotation was applied to the 30 by 30 matrix. Evidence is presented supporting 8 statistically significant uncorrelated factors at the pre-school level and 10 factors after 1 yr. of school. At least 6 factors are readily identified by WISC subtests, or by combinations of WISC subtests. Our findings support Garrett's developmental theory of intelligence. By age 6 differential mental abilities are clearly discernible. Six factors extracted at pre-school level are stable and congruent with those found after 1 yr. of school.

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References

Ammons

R. B.

Ammons

H. S.

Full-Range Picture Vocabulary Test. Missoula, Mont.: Psychological Test Specialists, 1948.

Baumeister

A. A.

Bartlett

C. J.

A comparison of the factor structure of normals and retardates on the WISC. Amer. J. ment. Defic., 1962, 66, 641–646.

Cohen

The factorial structure of the WAIS between early adulthood and old age. J. consult. Psychol., 1957, 21, 283–290.

Cohen

The factorial structure of the WISC at ages 7–6, 10–6, and 13–6. J. consult. Psychol., 1959, 23, 285–299.

Dunn

L. M.

Peabody Picture Vocabulary Test Minneapolis: American Guidance Service, Inc., 1959.

Garrett

H. E.

A developmental theory of intelligence. Amer. Psychologist, 1946, 1, 372–378.

Gault

Factorial patterns of the Wechsler Intelligence Scales. Aust. J. Psychol., 1954, 6, 85–93.

Guilford

J. P.

Personality. New York: McGraw-Hill, 1959.

Kaiser

H. F.

The varimax criterion for analytic rotation in factor analysis. Psychometrika, 1958, 23, 187–200.

10.

Maxwell

A. E.

Obtaining factor scores on the Wechsler Adult Intelligence Scale. J. ment. Sci., 1960, 106, No. 444.

11.

Meyers

C. E.

The structure of abilities at the preschool ages: hypothesized domains. Psychol. Bull., 1960, 57, 514–532.

12.

Meyers

C. E.

Primary abilities at mental age six. Monogr., Soc. Res. Child Develpm., 1962, No. 27.

13.

Osborne

R. T.

Factorial composition of the Wechsler Intelligence Scale for children at the pre-school level. Psychol. Rep., 1963, 13, 443–448.

14.

Saunders

D. R.

On the dimensionality of the WAIS Battery for two groups of normal males. Psychol. Rep., 1959, 5, 529–541.

15.

Tucker

L. R.

A method of synthesis of factor analysis studies. Washington, D. C.: Dept. of Army, 1951. Personnel Res. Sec. Rep., No. 984.

16.

Wechsler

Wechsler Intelligence Scale for Children, manual. New York: Psychological Corp., 1949.