Hi, I have the following question. Let us consider a trivariate VAR model. The parameters of the model are estimated using: system method=sur equation Y const Y(-1) X(-1) Z(-1) equation X const Y(-1) X(-1) Z(-1) equation Z const Y(-1) X(-1) Z(-1) end system I'd like study Granger causality from X to Y and the critical values are calculated using bootstrap method based on residuals. Is this procedure implemented in gretl? Best regards. Alessandro