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Re: st: factor variables and qreg?

From   "Roger B. Newson" <>
Subject   Re: st: factor variables and qreg?
Date   Fri, 24 Aug 2012 19:58:44 +0100

Thanks to Bill for this information. Would I be right in guessing that StataCorp are also working on clustered variances for -qreg-?

Best wishes


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Web page:
Departmental Web page:

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

On 24/08/2012 19:01, William Gould, StataCorp LP wrote:
Ariel Linden <> wrote,

I wonder if any StataCorp people on the list could respond to this
query [why qreg does not allow factor variables] with a definitive

We at StataCOrp are working on making -qreg- with factor variables.
Maarten Buis <> speculated

-qreg- seems to have its own build-in maximization algorithm, which
does not surprise me as it is a maximization problem with its own
peculiar set of difficulties. So it is a lot more work to implement

Maartin is correct.  We're working on it now, however, and have been
working on it since before this thread arose.

-- Bill

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