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اقتصاد::
متغیر داخلی
represent the structure of economy, where represents the natural logarithm (n x 1) vector of the endogenous variables, stands for the natural logarithm of exogenous and lagged endogenous variables and is the matrix of structural innovations.
In comparison with univariate time-series models there is no need to specify exogenous and endogenous variables since all variables in VAR models are endogenous.
The advantage of SVAR models over VAR models or traditional models is that the focus is on obtaining information about the shocks' driving movements in the endogenous variable and the identification of the effect of these shocks on movements between these endogenous variables.
Blanchard and Quah (1989) suggest imposing zero restrictions on levels only on the long-run effects of structural shocks in endogenous variables.
SVAR models as well as VAR models are particularly useful when the determinants of endogenous variable movements are unobservable.
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