'Retrieve a simulation smoother for the state space model.
Parameters
simulation_output : int, optional
Determines which simulation smoother output is calculated.
Default is all (including state and disturbances).
**kwargs
Additional keyword arguments, used to set the simulation output.
See `set_simulation_output` for more details.
Returns
SimulationSmoothResults'

def simulation_smoother(self, simulation_output=None, **kwargs):

    return self.ssm.simulation_smoother(simulation_output=simulation_output, **kwargs)
