Problems of Association for Bivariate Circular Data and a New Test of Independence.
MADAN LAL PURI, J. S. Rao · 1977
Measures of association and regression suggested thus far in connection with bivariate circular data, have been briefly reviewed. A new test statistic for testing coordinate independence of observations on a torus, is proposed and its asymptotic null distribution derived using Fourier analysis methods. (Author)