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Issues of Cost and Efficiency in the Design of Reliability Studies
Author(s) -
Shoukri M. M.,
Asyali M. H.,
Walter S. D.
Publication year - 2003
Publication title -
biometrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.298
H-Index - 130
eISSN - 1541-0420
pISSN - 0006-341X
DOI - 10.1111/j.0006-341x.2003.00127.x
Subject(s) - intraclass correlation , reliability (semiconductor) , variance (accounting) , statistics , reliability engineering , mathematics , computer science , psychometrics , engineering , economics , power (physics) , physics , accounting , quantum mechanics
Summary . 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.