Fig. 3

Estimated power of random samples (n = 20) drawn from bimodal distributions von Mises distributions [symmetrical: (a) and asymmetrical: (b)] and from bimodal wrapped skew normal distributions [symmetrical: (c) and asymmetrical: (d)], with a range of concentration/dispersion parameters. That is, for a the sample is drawn from an underlying distribution made of up two identical von mises distributions with central values positioned a half circle away from each other; c is the same but using wrapped skew normal distributions. b Is like a, and d is like c except that the two distributions are now only a quarter circle apart