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Power calculation for the likelihood ratio-test when comparing two dependent intraclass correlation coefficients.

Authors
  • Giraudeau, B1
  • Porcher, R
  • Mary, J Y
  • 1 INSERM CIC 202, Faculté de Médecine, 10 Bd Tonnellé, BP 3223, 37032 Tours Cedex 1, France. [email protected]
Type
Published Article
Journal
Computer Methods and Programs in Biomedicine
Publisher
Elsevier
Publication Date
February 2005
Volume
77
Issue
2
Pages
165–173
Identifiers
PMID: 15652638
Source
Medline
License
Unknown

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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