THE RETENTION INDEX AND THE RESCALED CONSISTENCY INDEX
James S. Farris
Department of Ecology and Evolution, State University of New York, Stony Brook, NY 11794, U.S.A. and Department of Entomology, American Museum of Natural History, Central Park West at 79th Street, New York, NT 10024, U.S.A. and Department of Biology, City College, City University of New York, U.S.A.
The observed variation has frequently been called the range of a character. That usage is appropriate for numerical characters, but not for others, such as sequence sites or those having multifurcating character state trees.