get_hetsked_sstvar
constructs structural STVAR model identified by heteroskedasticity
based on a reduced form STVAR model.
get_hetsked_sstvar(stvar, calc_std_errors = FALSE)
Returns an object of class 'stvar'
defining a structural STVAR model identified by heteroskedasticity,
with the main diagonal of the impact matrix normalized to be positive.
a an object of class 'stvar'
, created by, e.g., fitSTVAR
,
specifying a reduced form or a structural model
Calculate approximate standard errors (based on standard asymptotics)?
The switch is made by simultaneously diagonalizing the two error term covariance matrices with a well known matrix decomposition (Muirhead, 1982, Theorem A9.9) and then normalizing the diagonal of the matrix W positive (which implies positive diagonal of the impact matrix). Models with more that two regimes are not supported because the matrix decomposition does not generally exists for more than two covariance matrices.
fitSSTVAR
, STVAR
, fitSTVAR
Muirhead R.J. 1982. Aspects of Multivariate Statistical Theory, Wiley.