Re: st: more informative names of dummy vars

[Roger Newson <roger.newson@kcl.ac.uk>]

At 11:13 10/12/02 +0100, Annelies Vos wrote:
> Hi all,
> I'm using: -xi: poisson patient i.origin- and so on.
> Origin refers to country of origin of the patients and is coded 1,2,..10
> and each value is labeled like "Morocco", "Somalia" etc.
> Now, when I perform -poisson- (or any other command using -xi-) I get
> estimates for:
> _Iorigin_1, _Iorigin_2 etc. Instead, I would like to get something like:
> _Imorocco, _Isomalia etc. or _Iori_moroc, _Iori_somal etc. that would
> make the outcomes readable...
>
> Does anyone know whether it is possible to name the dummies depending on
> the labels of the values of the variable they refer to?
One simple possibility is to use the -rename- command; see the manual under 
-[R] rename-. Annelies might type

xi i.origin
for X in numlist 1(1)10) \ Y in any morocco somalia britain holland usa 
belgium china ecuador venezuela uzbekistan:rename _Iorigin_X  _Iori_Y
poisson patient _Iori*

This uses the -for- command to do a lot of repeats; see -help for- or the 
manuals under -[R] for-.

A slightly more advanced way might involve the use of the -parmest-, 
-descsave- and -factext- packages. A tutorial on the use of these is 
available at the Stata User Meetings website at

http://ideas.repec.org/s/boc/usug02.html

However, the simple way will do what Annelies wants.

I hope this helps.

Roger


--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
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Tel: 020 7848 6648 International +44 20 7848 6648
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  or 020 7848 6605 International +44 20 7848 6605
Email: roger.newson@kcl.ac.uk

Opinions expressed are those of the author, not the institution.

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