Biometrika 1969 56(3):571-577; doi:10.1093/biomet/56.3.571
© 1969 by Biometrika Trust
Nonparametric symmetry tests for circular distributions
SIEGFRIED SCHACH
The Johns Hopkins University
In this paper the locally most powerful rank test for testing the symmetry axis of a symmetric circular distribution is derived. Then an efficiency expression for a class of linear rank tests is obtained. The results are applied to the class of von Mises distributions and efficiency results for the sign test and the Wilcoxon test are calculated.

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