Implementation of the N4SID algorithm for subspace identification [1], together with Kalman filtering and state-space models.

State-space models are versatile models for representing multi-dimensional timeseries. As an example, the ARMAX(p, q, r)-models - AutoRegressive MovingAverage with eXogenous input - are included in the representation of state-space models. By extension, ARMA-, AR- and MA-models can be described, too. The numerical implementations are based on [2].