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Published on: January 31, 2014
Issues of cost and efficiency in the design of reliability studies
M M Shoukri1, M H Asyali, S D Walter
1Department of Biostatistics, Epidemiology and Scientific Computing, King Faisal Specialist Hospital and Research Center, P.O. Box 3354, Riyadh, Saudi Arabia. shoukri@kfshrc.edu.sa
Abstract:
Reliability of continuous and dichotomous responses is usually assessed by means of the intraclass correlation coefficient (ICC). We derive the optimal allocation of the number of subjects k and the number of repeated measurements n that minimize the variance of the estimated ICC. Cost constraints are discussed for the case of normally distributed responses. Tables showing optimal choices of k and n are given, along with guidelines for the design of reliability studies in light of our results and those reported by others.
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