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The extent to which an instrument, scale or other measure generates consistent results. Reliability is dependent upon the context in which an instrument is administered, rather than representing a specific property of an instrument under all conditions.
Berger, M. et al. 2003. Health Care, Cost, Quality, and Outcomes: ISPOR Book of Terms, Lawrenceville, NJ: International Society for Pharmacoeconomics and Outcomes Research.
Gliner, J.A. and G.A. Morgan. 2000. Research Methods in Applied Settings, Mahwah, NJ: Lawrence Erlbaum Associates.
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