Asymptotically consistent estimate of covariance of the sample mean
\sqrt(T) (\bar{y} - \mu) \rightarrow {\cal N}(0, \Sigma_{\bar{y}})\\ \Sigma_{\bar{y}} = B \Sigma_u B^\prime, \text{where } B = (I_K - A_1 - \cdots - A_p)^{-1}
Notes
Lutkepohl Proposition 3.3
sm.tsa.vector_ar.var_model.VARResults.acorr
sm.tsa.vector_ar.var_model.VARResults.fevd
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