Quantification of heart rate variability by discrete nonstationary non-Markov stochastic processes.

  title={Quantification of heart rate variability by discrete nonstationary non-Markov stochastic processes.},
  author={Renat M. Yulmetyev and Peter H{\"a}nggi and Fail Mubarakovich Gafarov},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={65 4 Pt 2A},
We develop the statistical theory of discrete nonstationary non-Markov random processes in complex systems. The objective of this paper is to find the chain of finite-difference non-Markov kinetic equations for time correlation functions (TCF) in terms of nonstationary effects. The developed theory starts from careful analysis of time correlation through nonstationary dynamics of vectors of initial and final states and nonstationary normalized TCF. Using the projection operators technique we… 

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