title: Power calculation for the likelihood ratio-test when comparing two dependent intraclass correlation coefficients.
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.
authors.affiliation: INSERM CIC 202, Faculté de Médecine, 10 Bd Tonnellé, BP 3223, 37032 Tours Cedex 1, France. giraudeau@med.univ-tours.fr
authors.forename: B
authors.initials: B
authors.lastname: Giraudeau
authors.forename: R
authors.initials: R
authors.lastname: Porcher
authors.forename: J Y
authors.initials: JY
authors.lastname: Mary
mesh_terms: D003627:Data Interpretation, Statistical; D005602:France; D016013:Likelihood Functions; D015233:Models, Statistical; D015203:Reproducibility of Results; D012494:Sampling Studies