title: Note: A statistical problem in testing invariance of movement using the phase plane model.
abstract: Invariant positions on a phase plane of joint angular position and velocity have been proposed as a means by which interlimb coordination may be achieved. This note identifies a problem in the testing, using conventional statistics, of hypotheses derived using the phase plane model. A possible solution is proposed based on directional statistics. Conclusions regarding phase angle invariance, which are based on conventional statistics, must be viewed with some caution.
authors.affiliation: Department of Human Movement Studies, The University of Queensland, St. Lucia 4072, Australia.
authors.forename: R
authors.initials: R
authors.lastname: Burgess-Limerick
authors.forename: B
authors.initials: B
authors.lastname: Abernethy
authors.forename: R J
authors.initials: RJ
authors.lastname: Neal