Upon re-testing with Shipley S-ILS (3 mo., 56 Ss), reliability coefficients are: Verbal, .77; Abstract, .63; Conceptual Quotient, .57; and Intelligence Quotient, .74 (all ps < .01). These coefficients and the pattern of mean-score increases suggest that the S-ILS is a “weak” measure of intellectual deterioration but a “better” measure of intellectual functioning.
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References
1.
GuilfordJ. P.Fundamental statistics in psychology and education. New York: McGraw-Hill, 1950.
2.
ShawD. J.The reliability of the Shipley-Institute of Living Scale. J. clin. Psychol., 1966, 22, 441.
3.
StoneL. A.Test-retest reliability of the Shipley-Institute of Living Scale. J. clin. Psychol., 1965, 21, 432.
