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Applied Psychological Measurement
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The Reliability of a Linear Composite of Nonequivalent Subtests

William W. Rozeboom

University of Alberta

Traditional formulas for estimating the reliability of a composite test from its internal item statistics are in appropriate to judge the reliability of multiple regres sions and other weighted composites of subtests that are appreciably nonequivalent. Formulas are provided here for the reliability of such a composite given the reliabilities of its component subtests, followed by a comparison of the composite's reliability to that of its components. Compositing can easily incur a substan tial loss of reliability, though gains are entirely possi ble as well.

Key Words: Index terms: combining nonequivalent subtests • composite reliability • item weighting • non equivalent subtests • nonhomogeneous item composites.

Applied Psychological Measurement, Vol. 13, No. 3, 277-283 (1989)
DOI: 10.1177/014662168901300307
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 Applied Psychological MeasurementHome page
W. W. Rozeboom
Postscript to "The Reliability of a Linear Composite of Nonequivalent Subtests"
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