The Structure and Best-Possible Bounds of Random Variables which Degree of Radial Asymmetry is

We study the random variables of radial asymmetry based on copulas. We research on the structure of random variables which radial asymmetry degree is and get the exact best-possible bounds of random variables which radial asymmetry degree is equal to . Then we expand to general case. We propose an essential condition of radial asymmetry degree is and study the structure of copula. We provide a broad bounds of copula that the radial asymmetry degree is .