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Wechsler Abbreviated Scale of Intelligence (WASI)

Reliability

Test-Retest

Subtests ranged from .83 to .91.

Significant results.

Amanda Zago

Disadvantages

Advantages

Internal Consistency

Demonstrated by the high and low alphas.

  • Some sacrifice of clinical accuracy
  • Not comprehensive
  • Ease of use
  • Broad age range
  • Different forms
  • Linkage
  • Parallels

Introduction

  • Individually administered intelligence test
  • Abridged version of Wechsler Adult Intelligence Scale (WAIS)
  • Introduced in 1999
  • Intended for individuals between the ages of 6 and 89
  • Consists of four subtests:

1. Vocabulary

2. Block Design

3. Similarities

4. Matrix Reasoning

Subtests

Validity

Convergent Validity- the degree to which two measures of constructs that should be related are in fact related.

  • Vocabulary- Measures knowledge of words and verbal concept formation
  • Similarities- Measures verbal concept formation and reasoning

These two combine to measure verbal-crystallized abilities (VIQ)

  • Block design- Measures the ability to analyze and synthesize abstract visual stimuli
  • Matrix reasoning- Measures fluid intelligence, classification and spatial ability, broad visual intelligence, knowledge of part-whole relationships, simultaneous processing, and perceptual organization

These two combine to measure nonverbal-fluid abilities (PIQ)

Demonstrated by correlation of WASI coefficients to Wide Range Intelligence Test (WRIT) coefficients.

M=100

SD=15

Convergent validity is also indicated by higher correlations between similar subtests.

References

Benefits of Abbreviated Measures

Stano, J. F. (2004). Test Review: Wechsler Abbreviated Scale of Intelligence. Rehabilitation Counseling Bulletin, 48(1), 56-57.

doi:10.1177/00343552040480010801

Canivez, G. L., Konold, T. R., Collins, J. M., & Wilson, G. (2009). Construct validity of the Wechsler Abbreviated Scale of

Intelligence and Wide Range Intelligence Test: Convergent and structural validity. School Psychology Quarterly, 24(4), 252-265. doi:10.1037/a0018030

Abu-Hilal, M. M., Al-Baili, M. A., Sartawi, A., Abdel-Fattah, F., & Al-Qaryouti, I. A. (2011). Psychometric properties of the

Wechsler Abbreviated Scale of Intelligence (WASI) with an Arab sample of school students. Individual Differences Research, 9(4), 219-230.

Irby, S. M., & Floyd, R. G. (2013). Review of 'Wechsler Abbreviated Scale of Intelligence, Second Edition'. Canadian Journal Of

School Psychology, 28(3), 295-299. doi:10.1177/0829573513493982

McCrimmon, A. W., & Smith, A. D. (2013). Review of 'Wechsler Abbreviated Scale of Intelligence, Second Edition (WASI-II)'.

Journal Of Psychoeducational Assessment, 31(3), 337-341.

Psychological Corp. (1999). Wechsler Abbreviated Scale of Intelligence Manual. San Antonio, TX: Author.

Meyer, M. (2000). Use of Wechsler Abbreviated Scale of Intelligence in a vocational rehabilitation sample. http://

www.ohiolink.edu/etd/view.cgi?ucin976036571, 23/12/2002.

  • Basic WAIS-IV kit=$2000. Basic WASI-II kit=$230.
  • "The demands of research protocols and managed care environments have imposed time constraints on psychological testing resulting in efforts to develop abbreviated forms of well-established psychometric measures." (Meyer, 2000)
  • Incremental validity
  • Valid assessment that saves time and money
  • Extremely useful for practitioners
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