  Stochastic systems feature, in general, both coherent dynamics and incoherent
transitions between different states. We propose a method to identify the
coherent part in the full counting statistics for the transitions. The proposal
is illustrated for electron transfer through a quantum-dot spin valve, which
combines quantum-coherent spin precession with electron tunneling. We show that
by counting the number of transferred electrons as a function of time, it is
possible to distill out the coherent dynamics from the counting statistics even
in transport regimes, in which other tools such as the frequency-dependent
current noise and the waiting-time distribution fail.
