Matlab kernel density excess mass estimate of data modality described by Fisher and Marron (2001).
References
N. I. Fisher and J. S. Marron, "Mode Testing via the Excess Mass Estimate," Biometrika 88 (2), 499-517 (2001).
G. S. Watson, “Goodness-of-Fit Tests on a Circle. I,” Biometrika 48 (1–2), 109–114 (1961).
D. Muir, "Kernel density estimation for circular functions" (https://www.mathworks.com/matlabcentral/fileexchange/44072-kernel-density-estimation-for-circular-functions), MATLAB Central File Exchange. Retrieved June 7, 2020.