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st: RE: AW: R: difference between two medians


From   "Newson, Roger B" <r.newson@imperial.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: AW: R: difference between two medians
Date   Wed, 25 Nov 2009 11:59:26 +0000

Alternatively, if you wanted to estimate differences between medians instead of median differences, you might want to use the -bpmedian- package and/or the -invcise- package, both of which can be downloaded from SSC using the -ssc- command. These packages use the method of inverse confidence interval standard errors.

The median difference is not the same thing as a difference between medians. This distinction causes a lot of culture shock to people who are accustomed to working with means and their differences. A few methodology documents on this issue are available from my website at
http://www.imperial.ac.uk/nhli/r.newson/papers.htm#miscellaneous_documents

Note that my website is now at Imperial College (see my signature below), and has not been at its old KCL address since 2006.

I hope this helps.

Best wishes

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: r.newson@imperial.ac.uk 
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: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss
Sent: 25 November 2009 10:46
To: statalist@hsphsun2.harvard.edu
Subject: st: AW: R: difference between two medians


<> 

" Pre-publication draft downloadable from Roger Newson's web site at
http://phs.kcl.ac.uk/rogernewson.";

With the moving wall at three years for the SJ, you can also access the
original publication free of charge:
http://www.stata-journal.com/sjpdf.html?articlenum=st0007



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Carlo Lazzaro
Gesendet: Mittwoch, 25. November 2009 11:46
An: statalist@hsphsun2.harvard.edu
Cc: 'CarlosAlencar'
Betreff: st: R: difference between two medians

Carlos might want to take a look at:

Newson R. 2002. Parameters behind "nonparametric" statistics: Kendall's tau,
Somers' D and median differences. The Stata Journal 2(1): 45-64.
Pre-publication draft downloadable from Roger Newson's web site at
http://phs.kcl.ac.uk/rogernewson.

Kind Regards,
Carlo
-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di CarlosAlencar
Inviato: mercoledì 25 novembre 2009 10.48
A: statalist@hsphsun2.harvard.edu
Oggetto: st: difference between two medians

Hi

i am new in using stata...

how coould i compare two medians? what  command should i use?

best regards

Carlos Alencar

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