Hamilton Variational Principle for Statistical Ensemble of Deterministic   Systems and its Application for Ensemble of Stochastic Systems
  Hamilton variational principle for special type of statistical ensemble of deterministic dynamical systems is derived. Thie form of variational principle allows one to describe the statistical ensemble in terms of wave functions and provides a basis for a description of statistical ensemble of stochastic systems. It is shown that sometimes such a statistical description of stochastic particle motion appears to coincide with the quantum description in terms of Schroedinger equation. 
Yuri A. Rylov