I have a similar issue I am hoping someone could help me with.
I assign and initialize my add factors as a variable shift add factor. See below. Everything seems to work out fine when I run my program.
smpl 2016 2020
However, when I decide to assign my add factors as an intercept shift, for some of my variables (not all), i too get an overflow message. How is it that I can solve for one type (variable shift) but not another (intercept shift) which I would think would be easier. Is there a possible solution to this issue. I dread to undertake the painful approach offered below.