Hi Alfonso,
Thank you for your excellent question.
If your command accepts factor variables, you should specify option
-buildfvinfo- on -ereturn post-. When I wrote the post, I decided
not to mention the -buildfvinfo-. I omit as many details as
possible to make these posts readable.
Answering your question, caused me to change my mind and the post.
Specifying -buildfvinfo- on -ereturn post- stores hidden information
that -ereturn display-, -contrast-, -margins-, and -pwcompare- use
to label tables and to decide which functions of the parameters are
estimable.
David