Returns the Z selector matrix in the observation equation.
r : int
In the context of the ARMA model r is max(p,q+1) where p is the AR order and q is the MA order.
Notes
Currently only returns a 1 x r vector [1,0,0,...0]. Will need to be generalized when the Kalman Filter becomes more flexible.
sm.tsa.kalmanf.kalmanfilter.KalmanFilter.T
sm.tsa.kalmanf.kalmanfilter.KalmanFilter.loglike
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