Doubts about using xi: command

[Robert Marin]

Hello Stata users: I'm new in Stata, and would like to ask a question related to the use of the command xi: I've been reading about this command, which can be really useful when we do a regression that might have too many Dummy Variables. Now my question is: Is there any way to avoit omitting the smallest value of a variable when using xi:, so I can include all the values in the model? As an example I have this.
I'd like to avoid the smallest values of my data to be excluded. .
xi: regress dep1 exporta I.year I.ciiu3_2d
I.year _Iyear_1995-2007 (naturally coded; _Iyear_1995 omitted)
I.ciiu3_2d _Iciiu3_2d_15-36 (naturally coded; _Iciiu3_2d_15 omitted)
Cheers, Robert.

[Carlo Lazzaro]

Robert:
I would take a look at -fvvarlist-

[Robert Marin]

Thanks a lot for the information!

[Richard Williams]

Carlo is certainly right about factor variables being vastly superior to the old xi: (It amazes me how xi: continues to live on so many years after it is usually no longer needed).

But as for the rest of your request -- "Is there any way to avoit omitting the smallest value of a variable when using xi:, so I can include all the values in the model?" That is going to be a problem. If there was only one categorical variable you could use the nonconstant option, but since you have two something is going to have to give somewhere. In most cases I think trying to use noconstant causes problems and isn't really worth it. If you prefer to use a different reference category that is easily done with factor variables.

[Robert Marin]

Thank you Richard, I really appreciate your help.