It might be helpful if Kate specified the reference for Puri and Sen's L statistic. We could then decide whether we knew about it, or if, as Maarten suggests, it is implemented under another name.
Hope this helps.
Roger
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
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: [email protected]
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/
Opinions expressed are those of the author, not of the institution.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Maarten buis
Sent: 11 January 2010 16:11
To: [email protected]
Subject: Re: st: Calculating Puri and Sen's L statistic for nonparametric ANCOVA
--- On Mon, 11/1/10, Kate Perper wrote:
> Does anyone know how I can calculate Puri and Sen's test
> statistic, L using Stata software? I am trying to use
> ANCOVA but my data violates the equality of slopes
> assumption.
I can't find that using -findit-, so either it is not
implemented or it is implemented under some other name. Anyhow,
isn't it much easier to add an interaction effect if you think
that the effect (slope) of your continuous variable differs
across groups?
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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