'Set the filtering method
The filtering method controls aspects of which Kalman filtering
approach will be used.
Parameters
filter_method : integer, optional
Bitmask value to set the filter method to. See notes for details.
**kwargs
Keyword arguments may be used to influence the filter method by
setting individual boolean flags. See notes for details.
Notes
This method is rarely used. See the corresponding function in the
`KalmanFilter` class for details.'

def set_filter_method(self, filter_method=None, **kwargs):

    self.ssm.set_filter_method(filter_method, **kwargs)
