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st: New version of -somersd- available on SSC

From   Roger Newson <>
Subject   st: New version of -somersd- available on SSC
Date   Thu, 29 May 2003 21:58:14 +0100

Fellow Statalisters

Thanks to Kit Baum, there is now a new version of the -somersd- package available on SSC. Type -ssc desc somersd- in Stata to find out more.

The -somersd- package is discussed at length in Newson (2002), and calculates confidence intervals for Kendall's tau-a and Somers' D, and unequal-variance confidence intervals for the Hodges-Lehmann median difference between two groups. The new version is still Stata 6, but has a pair of .pdf manuals typeset in Plain TeX (complete with Methods and Formulas) as ancillary files, and a pair of improved Stata 6 help files.

Ideally, a state-of-the-art Stata 8 version of the -somersd- package would have LaTeX .pdf manuals with hypertext, .smcl help files with more hypertext, and plugins (also known as DLLs) to make it run faster. However, StataCorp are still working on DLLs. (And thanks again to Bobby Gutierrez and Chinh Nguyen for a really exciting presentation on DLLs at the UK Stata User Meeting earlier this month.)

Best wishes



Newson R. Parameters behind "nonparametric" statistics: Kendall's tau, Somers' D and median differences. The Stata Journal 2002; 2(1): 45-64. A pre-publication draft can be downloaded from my website by typing
net from
in Web-aware Stata. (And thanks to Vince Wiggins, and to all at StataCorp, for saying that it is OK to post pre-publication SJ drafts on our websites.)

Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648
Fax: 020 7848 6620 International +44 20 7848 6620
or 020 7848 6605 International +44 20 7848 6605

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

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