title: Absence of determinism in El Niño Southern Oscillation.
abstract: We perform two direct determinism tests on the El Niño Southern Oscillation index monthly average series. The results indicate that, for timescales over 1 month, the series does not exhibit determinism, an essential feature of chaos.
authors.affiliation: Department of Physics and Astronomy, University of Hawaii, 200 West Kawili Street, Hilo, Hawaii 96720, USA. pbinder@hawaii.edu
authors.forename: P-M
authors.initials: PM
authors.lastname: Binder
authors.forename: Camilo A
authors.initials: CA
authors.lastname: Wilches