On Fri, 12 Feb 2021, mandeep kaur wrote:
Sir, I am using gretl-2018a with retobit 0.9 version.
Hmm, retobit 0.9 dates from August 2020, but when gretl-2018a was
released there was no "--opg" option for the tobit command. This
problem should be resolved if you update to current gretl.
Allin Cottrell