title: Percentage agreement and phi: A conversion table.
abstract: STUDIES IN APPLIED BEHAVIOR ANALYSIS HAVE USED TWO EXPRESSIONS OF RELIABILITY FOR HUMAN OBSERVATIONS: percentage agreement (including percentage occurrence and percentage nonoccurrence agreement) and correlational techniques (including the phi coefficient). The formal relationship between these two expressions is demonstrated, and a table for converting percentage agreement to phi, or vice-versa, is presented. It is suggested that both expressions be reported in order to communicate reliability unambiguously and to facilitate comparison of the reliabilities from different studies.
authors.affiliation: California State College, Stanislaus.
authors.forename: L M
authors.initials: LM
authors.lastname: Lewin
authors.forename: J A
authors.initials: JA
authors.lastname: Wakefield