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Fig. 4 | BMC Ecology

Fig. 4

From: The Hermans–Rasson test as a powerful alternative to the Rayleigh test for circular statistics in biology

Fig. 4

Estimated power of random samples (n = 20) drawn from bimodal distributions. In a, c we vary the central concentration points of the two identical constituent distributions (changing from exactly coincident with each other at the left extreme to exactly opposite each other at the right). In a the two distributions are von Mises with κ = 3; in c they are wrapped skew normal distributions with ω = 1. In b, d the two constituent distributions are at opposite points on the circle but now their concentration parameters differ, one is fixed, the value of the other distribution given on the x-axis. In b the two distributions are von Mises with κ = 3 for the fixed value; in d they are wrapped skew normal distributions with ω = 1 for the fixed value

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