'Generated vector of states by iterating on the transition equation,
given a random initial state draw and random disturbance draws.
Notes
.. math::
lpha_{t+1}^+ = c_t + T_t lpha_t^+ + \eta_t^+'

@property
def generated_state(self):

    if (self._generated_state is None):
        self._generated_state = np.array(self._simulation_smoother.generated_state, copy=True)
    return self._generated_state
