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RE: st: Tests for trend


From   "Newson, Roger B" <r.newson@imperial.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Tests for trend
Date   Thu, 15 Mar 2007 17:10:30 -0000

Two possible ordinal trend measure not detected by

findit trend test

are Somers' D and Kendall's tau-a. These are trend parameters (not just trend tests), expressed as differences between concordance probabilities. They can be estimated (with confidence limits and not just P-values) using the -somersd- package. The Stata 9 version of -somersd- is downloadable from SSC using the -ssc- command. The Stata 6 version is still available to users of Stata 6, 7 and 8, and can be downloaded from my website using the command

net from http://www.imperial.ac.uk/nhli/r.newson/stata6/

More about Somers' D and Kendall's tau-a can be found in Newson (2006) and Newson (2002) (see below).

I hope this helps.

Roger


References

Newson R. Confidence intervals for rank statistics: Somers' D and extensions. The Stata Journal 2006; 6(3): 309-334. Download pre-publication draft from
http://www.imperial.ac.uk/nhli/r.newson/papers.htm

Newson R. Parameters behind "nonparametric" statistics: Kendall's tau, Somers' D and median differences. The Stata Journal 2002; 2 (1): 45-64. Download pre-publication draft from
http://www.imperial.ac.uk/nhli/r.newson/papers.htm


Roger Newson
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: r.newson@imperial.ac.uk 
www.imperial.ac.uk/nhli/r.newson/

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

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Diego Bellavia
Sent: 15 March 2007 16:35
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Tests for trend

Thanks a lot !

What is the formal name of the nptrend test ? 

----- Messaggio originale -----
Da: Nick Cox <n.j.cox@durham.ac.uk>
A: statalist@hsphsun2.harvard.edu
Inviato: Luned́ 12 marzo 2007, 6:01:26
Oggetto: RE: st: Tests for trend


Among other additions is Joseph Coveney's implementation
-jonter- of the Jonckheere-Terpstra test. 

. ssc desc jonter 

Nick 
n.j.cox@durham.ac.uk 

Svend Juul

> Diego wrote:
> 
> I would need  a  brief summary on the parametric, non parametric tests
> for trend in STATA including also exact inference for ordered
> contingency tables. Links will be greatly appreaciated. 
> -----------------------------------------------------
> 
> -findit trend test- gives a lot of suggestions. You might 
> want to start
> with these FAQs:
> 
> FAQ     . . .. . . . . .  A comparison of different tests for trend
>         . . .. . . . . . . . . . . . . . . . . . . . . . W. Sribney
>         3/96    Does Stata provide a test for trend?
>                 http://www.stata.com/support/faqs/stat/trend.html
> 
> FAQ     . How can I test for a trend across a categorical variable?
>         .. . . . . . . . . . . .  UCLA Academic Technology Services
>         10/06   http://www.ats.ucla.edu/stat/stata/faq/test_trend.htm
> 

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