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Biometrika 1986 73(2):525-527; doi:10.1093/biomet/73.2.525
© 1986 by Biometrika Trust
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Miscellanea

Approximate confidence intervals for the mean direction of a von Mises distribution

GRAHAM J. G. UPTON

Department of Mathematics, University of Essex Colchester C04 3SQ, U.K.

Simple formulae are suggested that provide accurate confidence bounds for the mean direction of a sample from a von Mises distribution. These formulae obviate the need for calculating an estimate of the second trigonometric moment, and dispense with nomograms.

Key Words: Confidence interval • Mean direction • Likelihood • von Mises distribution


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