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re: Re: st: factor variables and qreg?

From   "Ariel Linden. DrPH" <>
To   <>
Subject   re: Re: st: factor variables and qreg?
Date   Sat, 25 Aug 2012 21:10:42 -0700


Now that we've opened Pandora's box (or created our holiday wish list)
regarding -qreg-, can we hope to see the command allow weights as well?



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

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
>> answer?
> 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
>> it.
> 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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