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Re: st: ranksum/Mann-Whitney command

From   Roger Newson <>
Subject   Re: st: ranksum/Mann-Whitney command
Date   Thu, 26 Aug 2004 21:02:55 +0100

At 19:38 26/08/2004, Holly wrote:

I would like to use the ranksum command on a sample population but the
command does not take weights.  Does anyone know of a command that will give
me the same  results for weighted data?
Maybe my own -somersd- package (downloadable from SSC) is what you are looking for. To find more about it it, type

ssc describe somersd

The -somersd- package can use frequency or probability weights, and calculates confidence limits for the 2 parameters corresponding to the ranksum test, namely Somers' D and the Hodges-Lehmann median difference. It comes with 2 .pdf manuals, and a reference to a Stata Journal paper on the subject (Newson, 2002), which can be downloaded as a pre-publication draft from my website.

I hope this helps.

Best wishes



Newson R. 2002. Parameters behind "nonparametric" statistics: Kendall's tau, Somers' D and median differences. The Stata Journal 2(1): 45-64.
A pre-publication draft of this paper can be downloaded from my website. In net-aware Stata, type

net from

to find how to do this.

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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