Tsai, Ming-Tien - In: Journal of Multivariate Analysis 100 (2009) 3, pp. 445-458
A general class of optimal and distribution-free rank tests for the two-sample modal directions problem on (hyper-) spheres is proposed, along with an asymptotic distribution theory for such spherical rank tests. The asymptotic optimality of the spherical rank tests in terms of power-equivalence...