Estimating WAIS-R IQ from the Shipley Institute of Living Scale: a replication

J Clin Psychol. 1991 Jul;47(4):558-62. doi: 10.1002/1097-4679(199107)47:4<558::aid-jclp2270470414>;2-w.


Zachary, Crumpton, and Spiegel (1985) introduced a linear regression and continuous norming procedure for estimating Full Scale WAIS-R IQ from the Shipley Institute of Living Scale. The present study replicated their method with 55 adult psychiatric inpatients and day hospital patients. A high correlation (r = .85), an extremely small mean difference in IQ (.8 points), and an acceptable average absolute difference (7.6 points) were found between estimated and obtained WAIS-R. Sines and Simmons tables (1959) for Shipley estimates of WAIS IQ produced a high correlation (r = .86), but large mean and average absolute differences (13.1 and 13.6 points, respectively). The study supports use of the Zachary et al. procedure for estimating WAIS-R IQ from Shipley scores in a psychiatric population.

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Brain Damage, Chronic / diagnosis*
  • Brain Damage, Chronic / psychology
  • Female
  • Humans
  • Intelligence*
  • Male
  • Middle Aged
  • Neuropsychological Tests / statistics & numerical data*
  • Psychometrics
  • Reproducibility of Results
  • Wechsler Scales / statistics & numerical data*