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Re: st: Generating dummies with xi


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Generating dummies with xi
Date   Mon, 11 Apr 2011 13:51:24 +0100

It is better to use factor variables directly than to use -xi:-.

The only exception would be if are using an out-of-date version of
Stata, say Stata 10, in which case you are asked to tell us that in
the Statalist FAQ.

That said, there seems to be some confusion here. First, -xi- will
generate all pertinent dummies if asked directly. Second, a modelling
command necessarily omits at least one such variable; that's the way
that dummies work. Third, the help for -xi:- explains the use of
-char- to get what you want, at least in Stata 10. (I don't have
access to earlier versions at this time.)

Nick

On Mon, Apr 11, 2011 at 1:34 PM, emanuele mazzini
<madsoenistata@gmail.com> wrote:
> Dear all Stata users,
> I just discovered the command xi to generate dummies, but I also
> noticed that by default it omits one of the values. This is obvious on
> one hand, but on the other hand, does anyone of you knows a way to
> tell Stata to generate dummies for all groups and to omit none of
> them?
>
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