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Re: st: test for trend of an ordinal predictor

From   Roger Newson <>
To   "" <>
Subject   Re: st: test for trend of an ordinal predictor
Date   Mon, 26 Apr 2010 16:32:59 +0100

A possible alternative to -nptrend- is the -somersd- package, downloadable from SSC. This has the advantage that it outputs confidence intervals for Somers' D (a measure of ordinal trend), instead of just a P-value for the null hypothesis of no ordinal trend.

I hope this helps.

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 26/04/2010 14:32, Neil Shephard wrote:
Less sophisticated but see also -man nptrend-

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