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Emergence of the wrapped Cauchy distribution in mixed directional data

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Abstract

Inferring the most appropriate distribution (or distributions) to describe observed directional data is important in many applications of circular statistics. In particular, animal movement paths are typically analysed and modelled by considering the distribution of step lengths and turning (or absolute) angles. Here we demonstrate that a single-wrapped Cauchy distribution can appear to fit directional data mixed from two different underlying wrapped normal distributions. We derive mathematical expressions to calculate the parameter space for which this occurs and illustrate the result by analysing an example data set of the movements of African bull elephants (Loxodonta Africana). We conclude that the presence of a wrapped Cauchy distribution in observed directional data can, in certain cases, be explained by data coming from two distinct underlying distributions. We discuss how this may relate to the presence of multiple movement modes within an observed path when analysing animal movement data.

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  1. Department of Mathematical Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK

    Joseph D. Bailey & Edward A. Codling

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Bailey, J.D., Codling, E.A. Emergence of the wrapped Cauchy distribution in mixed directional data. AStA Adv Stat Anal 105, 229–246 (2021). https://doi.org/10.1007/s10182-020-00380-7

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