  In physics, it is frequently needed to precisely measure the count rate of
some process. Quite often one needs to account for electronics dead time,
pile-up and other features of data acquisition system to avoid systematic
shifts of the count rate. In this article, we present a statistical mechanism
to diminish or completely eliminate systematic errors arising from the
correlation between the events. Also, we present examples of application of
this method to the analysis of "Troitsk nu-mass" and "Tristan in Troitsk"
experiments.
