  To investigate the repeater content of gamma ray burst samples I develop two
models where sources burst at a constant average rate. I find that the sky
coverage affects the number of repeaters in a sample predominantly through the
detector livetime, and that the number of bursts in the sample is the primary
parameter. Thus the repeater content of burst samples should be compared within
the context of a repetition model; a direct comparison between two samples is
possible only if the samples have similar sizes. The observed repeater fraction
may not be the actual fraction if the sources burst on average less than once
during the detector livetime. Sources which burst repeatedly during active
phases separated by more than the observation period must be treated
separately.
