'Generated vector of observations by iterating on the observation and
transition equations, given a random initial state draw and random
disturbance draws.
Notes
.. math::
y_t^+ = d_t + Z_t lpha_t^+ + arepsilon_t^+'

@property
def generated_obs(self):

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