narrative Sign restrictions with svar model (in Sata18.5)

[Th Albin]

Hello, I would like to estimate a svar model with narrative sign restriction in stata18.5 , but I don't know the right command. For example, I have five variables X1 X2 X3 X4 and X5 for data from 1980 to 2019. My narrative sign restrictions are that, based on economic theory, I impose that the shock of X5 has a positve effect on X1 X2 X3 at specific date 1990 and 1998 , and negative effect on X4 at the date 1995. I want to estimate the svar and show impulses responses graph. Please I need your help.