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  • Title: Power calculation for the likelihood ratio-test when comparing two dependent intraclass correlation coefficients.
    Author: Giraudeau B, Porcher R, Mary JY.
    Journal: Comput Methods Programs Biomed; 2005 Feb; 77(2):165-73. PubMed ID: 15652638.
    Abstract:
    Comparing the reproducibility level of two devices with continuous outcome on a unique sample of subjects (each subject being assessed several times with both devices) comes down to compare two dependent intraclass correlation coefficients (ICCs). When planning such a reproducibility study, one has to specify both the number of subjects to be included and the number of replicates per subject associated to each device. We propose SAS and S-plus macros, which allow power calculations by implementing a simulation study where dependent ICCs are compared by means of a likelihood ratio-test.
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