Page 1 of 1

Hessian is singular at iteration 1

Posted: Mon Jun 08, 2020 7:55 pm
by joshi27s
I am using EViews 11 to run simulations from the FRB/US model, specifically program "ocpolicy", when I encountered the following message:
Screen Shot 2020-06-08 at 10.54.52 PM.png
Screen Shot 2020-06-08 at 10.54.52 PM.png (58.41 KiB) Viewed 1230 times


Unlike error messages, this doesn't display from which line of code the problem has arisen. So, I'm unsure how to handle it as the entire simulation stops. Please help.

Re: Hessian is singular at iteration 1

Posted: Tue Jun 09, 2020 9:23 am
by EViews Matt
Hello,

That error is generated by one of the FRB/US model program subroutines (in mce_solve_library.prg) rather than by EViews. I haven't been able to recreate this issue running the stock ocpolicy.prg with the unmodified database.

Re: Hessian is singular at iteration 1

Posted: Sun Jun 21, 2020 11:28 pm
by Elderfield.A
I gather you are running an optimal control scenario. In my experience, this happens when your control variable(s) do not have an effect on your target variables - it usually happens to me when I forget to update a sample :lol: