This study evaluated the concurrent validity of estimated Wechsler Adult Intelligence Scales—Third Edition (WAIS-III) index scores using various one- and two-subtest combinations. Participants were the Canadian WAIS-III standardization sample. Using all possible one- and two-subtest combinations, an estimated Verbal Comprehension Index (VCI), an estimated Perceptual Organization Index (POI), and an estimated Working Memory Index (WMI) were generated by prorating relevant subtest scores. As expected, two-subtest short forms were consistently more accurate than one-subtest short forms. Agreement between short-form and full-form index scores was high for two-subtest combinations (range = 88% to 96%) but only moderate with one subtest (range = 62% to 79%). Accuracy did not vary by age, ethnicity, gender, or education. However, accuracy was lowest for index scores in the high average to very superior range. These results suggest that although some two-subtest short forms are useful for estimating VCI, POI, and WMI scores, one-subtest short forms should not be used for this purpose.
Axelrod, B.N., Dingell, J.D., Ryan, J.J., & Ward, L.C. (2000). Estimation of Wechsler Adult Intelligence Scale-III index scores with the 7-subtest short form in a clinical sample. Assessment, 7, 157-161.
2.
Axelrod, B.N., & Paolo, A.M. (1998). Utility of the WAIS-R seven-subtest short form as applied to the standardization sample. Psychological Assessment , 10, 33-37.
Axelrod, B.N., Ryan, J.J., & Ward, L.C. (2001). Evaluation of seven-subtest short forms of the Wechsler Adult Intelligence Scale-III in a referred sample. Archives ofClinical Neuropsychology, 16, 1-8.
5.
Blyer, C.R., Gold, J.M., Iannone, V.N., & Buchanan, R.W. (2000). Short form of the WAIS-III for use with patients with schizophrenia. Schizophrenia Research , 46, 209-215.
6.
Boone, D.E. (1991). Item-reduction vs. subtest-reduction short forms on the WAIS-R with psychiatric inpatients. Journal of Clinical Psychology, 47, 271-276.
7.
Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale, NJ: Lawrence Erlbaum.
8.
Doppelt, J.E. (1956). Estimating the full scale score on the Wechsler Adult Intelligence Scale from scores on four subtests. Journal of Consulting Psychology, 20, 63-66.
9.
Donders, J., & Axelrod, B.N. (2002). Two-subtest estimations of WAIS-III factor index scores. Psychological Assessment, 14, 360-364.
10.
Engelhart, C.I., Eisenstein, N., Johnson, V., & Losonczy, M. (1999). Comparison of linear equating and prorated short forms for estimating WAIS-R FSIQ in a neuropsychological population. Clinical Neuropsychologist, 13, 95-99.
11.
Gorsuch, R.L., & Kittrell, C. (2001). Continuous norming of psychological tests. Paper presented at the annual meeting of the Ontario Psychological Association, Toronto, Canada.
12.
Guertin, W., Rabin, A.I., Frank, G.H., & Ladd, C.E. (1962). Research with the Wechsler Intelligence Scale for Adults: 1955-60. Psychological Bulletin,59, 1-26.
13.
Hilsabeck, R.C., Schrager, D.A., & Gouvier, W.D. (1999). External validation of the equivalence of two formulas for the WAIS-R seven-subtest short form. Applied Neuropsychology, 6, 239-242.
14.
Iverson, G.L., Guirguis, M., & Green, P. (1997). Assessing intellectual functioning in persons with schizophrenia spectrum disorders using a seven subtest short form of the WAIS-R. Schizophrenia Research, 30, 165-168.
15.
Iverson, G., Lange, R.T., Viljoen, H. (2006). Interpretive effects of using Canadian versus American WAIS-III normative systems. Canadian Journal of Behavioural Science, 38(4), 348-353.
16.
Iverson, G.L., Myers, B., Bengtson, M.L., & Adams, R.L. (1996). Concurrent validity of the WAIS-R seven-subtest short form in patients with brain impairment. Psychological Assessment, 8, 319-323.
17.
Jeyakumar, S.L.E., Warriner, E.M., Raval, V.V., & Ahmad, S.A. (2004). Balancing the need for reliability and time efficiency: Short forms of the Wechsler Adult Intelligence Scale-III. Educational and Psychological Measurement, 64, 71-87.
18.
Kulas, J.F., & Axelrod, B.N. (2002). Comparison of seven-subtest and Satz-Mogel short forms of the WAIS-III. Journal of Clinical Psychology, 58, 773-782.
19.
Levy, P. (1967). The correction for spurious correlation in the evaluation of short-form tests. Journal of Clinical Psychology , 23, 84-86.
20.
Mattis, P.J., Hannay, H.J., & Meyers, C.A. (1992). Efficacy of the Satz-Mogel short form WAIS-R for tumor patients with lateralized lesions. Psychological Assessment , 4, 357-362.
21.
Paolo, A.M., & Ryan, J.J. (1993). WAIS-R abbreviated forms in the elderly: A comparison of the Satz-Mogel with the seven-subtest short form. Psychological Assessment, 5, 425-429.
22.
Pilgrim, B.M., Meyers, J.E., Bayless, J., & Whetstone, M.M. (1999). Validity of the Ward seven-subtest WAIS-III short form in a neuropsychological population. Applied Neuropsychology, 6, 243-246.
23.
The Psychological Corporation. (1999). Wechsler Abbreviated Scale of Intelligence. San Antonio, TX: Author.
24.
Roberts, J.K., & Henson, R.K. (2002). Correction for bias in estimating effect sizes . Educational and Psychological Measurement, 62, 241-253.
25.
Ryan, J.J. (1999). Two types of tables for use with the seven-subtest short forms of the WAIS-III. Journal of Psychoeducational Assessment, 17, 145-151.
26.
Ryan, J.J., Abraham, E., Axelrod, B.N., & Paolo, A.M. (1996). WAIS-R Verbal-Performance IQ discrepancies in persons with lateralized lesions: Utility of a seven-subtest short form. Archives of Clinical Neuropsychology, 11, 207-213.
27.
Satz, P., & Mogel, S. (1962). An abbreviation of the WAIS for clinical use. Journal of Clinical Psychology, 18, 77-79.
28.
Silverstein, A.B. (1990). Critique of a Doppelt-type short form of the WAIS-R . Journal of Clinical Psychology, 46, 333-339.
Ward, L.C. (1990). Prediction of verbal, performance, and full scale IQs from seven subtests of the WAIS-R. Journal of Clinical Psychology, 46, 436-440.
31.
Ward, L.C., & Ryan, J.J. (1997). Validity of quick short forms of the Wechsler Adult Intelligence Scale—Revised with brain-damaged patients. Archives of Clinical Neuropsychology, 12, 63-69.
32.
Wechsler, D. (1981). Wechsler Adult Intelligence Scale—Revised. New York: The Psychological Corporation.
33.
Wechsler, D. (1991). Wechsler Intelligence Scale for Children —Third Edition. San Antonio, TX: The Psychological Corporation.
34.
Wechsler, D. (1997). Wechsler Adult Intelligence Scale—Third Edition. San Antonio, TX: The Psychological Corporation.
35.
Wechsler, D. (2001). Wechsler Adult Intelligence Scale—Third Edition: Canadian technical manual. Toronto, Canada: Harcourt Canada.
36.
Wymer, J.H., Rayls, K., & Wagner, M.T. (2003). Utility of a clinically derived abbreviated form of the WAIS-III. Archives of Clinical Neuropsychology, 18, 917-927.
