Function ekf_smoother
runs the (iterated) extended Kalman smoother for
the given non-linear Gaussian model of class nlg_ssm
,
and returns the filtered estimates and one-step-ahead predictions of the
states \(\alpha_t\) given the data up to time \(t\).
ekf_smoother(object, iekf_iter = 0)
Model object
If iekf_iter > 0
, iterated extended Kalman filter is
used with iekf_iter
iterations.
List containing the log-likelihood,
smoothed state estimates alphahat
, and the corresponding variances Vt
and
Ptt
.