spectral bandwith; dichotomic classification
The irregularity coefficient is one of the numerical characteristics of the spectral bandwith of a stationary random process. Its basic properties are investigated and the application to the dichotomic classification of a process into narrow-band and wide-band ones is given. Further, its behaviour is analyzed for sufficiently wide classes of stationary processes whose spectral densities frequently appear both in theory and applications.
 H. Cramer M. R. Leadbetter: Stationary and related stochastic processes
. John Wiley, New York 1967. MR 0217860
 V. I. Tichonov: Excursions of random processes. (Russian). Nauka, Moskva 1970.