A statistical treatment is given of the generation-recombination noise
in a semiconductor with a conduction band and two traps X and Y. The
system is described in terms of x and y, where x is half the harmonic
mean of the numbers of occupied and empty traps X. A corresponding def
inition is given for y. The use of x and y makes the formalism very tr
ansparent. Simple, explicit relations are easily found, which can be f
urther simplified by approximations depending on the ratios between N,
x and y. We consider correlations and Burgess' theorem; time dependen
ce and spectra are not discussed.