However, the most common approach for sign restricted VARs is based on Bayesian methods of inference. There have been both frequentist and Bayesian approaches to summarizing estimates of the admissible set of sign-identified structural VAR models. In other words, the data are potentially consistent with a wide range of structural models that are all admissible in that they satisfy the identifying restrictions. Because sign restrictions represent inequality restrictions, sign restricted VARs are only set identified. For traditional structural VARs (SVARs), there is a unique point estimate of the structural impulse response function. The main difference between a classic VAR and a sign restricted VAR is interpretation. In this blog, we describe the SRVAR add-in based on Uhlig (2005). In particular, They show the dangers of using penalty function approaches (PFA) when implementing sign and zero restrictions to identify structural VARs (SVARs). Recently Arias, Rubio-Ramirez and Waggoner (2018), henceforth ARW, developed algorithms to independently draw from a family of conjugate posterior distributions over the structural parameterization when sign and zero restrictions are used to identify SRVARs. Recovering Structural Shocks from an SRVARįollowing the seminal work of Uhlig (2005), the uniform-normal-inverse-Wishart posterior over the orthogonal reduced-form parameterization has been dominant for SRVARs.In contrast, SRVARs can easily identify structural shocks since in many cases, economic theory only offers guidance on the sign of structural impulse responses on impact. Traditional structural VARs are identified with the exclusion restriction which is sometimes difficult to justify by economic theory. They have been used for macroeconomic policy analysis when investigating the sources of business cycle fluctuations and providing a benchmark against which modern dynamic macroeconomic theories are evaluated. Nowadays, sign restricted VARs (SRVARs) are becoming popular and can be considered as an indispensable tool for macroeconomic analysis. Authors and guest post by Davaajargal Luvsannyam and Ulziikhutag Munkhtsetseg