Testing for Circular Reflective Symmetry about a Known Median Axis
Circular data arise in many contexts, a particularly rich source being animal orientation experiments. Often, in the analysis of such data, a fundamental question of scientific interest is whether the underlying distribution is reflectively symmetric about some specific axis. In this
paper, the situation in which the axis of interest is known to be a median axis is considered and a simple, asymptotically distribution- free test for circular reflective symmetry against skew alternatives is developed. The results from a simulation study lead to a testing strategy incorporating
the new test and the circular analogue of the modified runs test of Modarres & Gastwirth (1996). The application of the testing strategy is illustrated using circular data arising from two animal orientation experiments.
Keywords: Circular data; hybrid testing strategy; modified runs test; skew alternates
Document Type: Research Article
Affiliations: Departamento de Matemáticas, Universidad de Extremadura, Cáceres, Spain
Publication date: 01 June 2004
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