  We consider the effects of shot noise and particle energy spread on
statistical properties of Cherenkov and quasi-Cherenkov superradiance emitted
by a relativistic electron beam. In the absence of energy spread, we have found
the root-mean-square deviations of both peak radiated power and instability
growth time as a function of the number of particles. It is shown that energy
spread can lead to a sharp drop in the radiated power of Cherenkov and
quasi-Cherenkov superradiance at high currents.
