[Gretl-users] Hessian with negative/missing diagonal elements ?

I was discussing with a colleague an empirical application, and he told me that the only problem he had was that some elements of the Hessian was "nan" because they came up with the wrong sign. But the R code that he used did print out the Hessian, with these elements as "nan". Can we do that in gretl (natively)? I ask because in standard mle-implementation with the option --hessian we may get "Hessian is not negative-definite, dropping back to OPG". What I ask is whether we can instruct gretl to stick with the Hessian, returning some "nan" values in the diagonal / std errors. -- Alecos Papadopoulos PhD Affiliate Researcher Dpt of Economics, Athens University of Economics and Business Foundation for Economic and Industrial Research (IOBE) web: alecospapadopoulos.wordpress.com/ ORCID:0000-0003-2441-4550