title: [Extent of agreement in case of complete identity].
abstract: Two diagnostic procedures with binary outcomes are usually compared by Cohen's kappa coefficient of agreement. If the results of the two procedures are completely identical on a sample and so kappa equals to 1, the precision of the estimate can not be computed with the usual formulae and statistical softwares. A formula for variance which is valid in this particular case is presented together with a real example.
authors.affiliation: Chinoin Rt. a Sanofi-Synthelabo vállalatcsoport tagja, Budapest. julia.singer@sanofi-synthelabo.com
authors.forename: Júlia
authors.initials: J
authors.lastname: Singer
mesh_terms: D000704:Analysis of Variance; D016001:Confidence Intervals; D003955:Diagnostic Tests, Routine; D006801:Humans; D008432:Mathematical Computing; D018401:Sample Size