J. W. (1931). "Frisch (Ragnar): Correlation and Scatter in Statistical Variables". Journal of the Royal Statistical Society. 94 (1): 95–98. doi:10.2307/2341822. JSTOR2341822.
J. W. (1931). "Frisch (Ragnar): Correlation and Scatter in Statistical Variables". Journal of the Royal Statistical Society. 94 (1): 95–98. doi:10.2307/2341822. JSTOR2341822.