Sunday, February 26, 2006

st: New version of -somersd- for SSC

Thanks to Kit Baum, a new version of the -somersd- package is now available for download from SSC. In Stata, use the -ssc- command to do this.

The -somersd- package will be described as below on my website when my website is next updated. In the new version, I have updated the online help, and the manual -somersd.pdf-, to document a previously unpublicized ability to recognize synonyms, and unambiguous abbreviations, for the transformation names specified by the -transf()- option of the -somersd- command. I would like to thank Nick Cox for suggesting this improvement.

Roger

Roger Newson Lecturer in Medical Statistics POSTAL ADDRESS: Respiratory Epidemiology and Public Health Group National Heart and Lung Institute at Imperial College London St Mary's Campus Norfolk Place London W2 1PG STREET ADDRESS: Respiratory Epidemiology and Public Health Group National Heart and Lung Institute at Imperial College London 47 Praed Street Paddington London W1 1NR TELEPHONE: (+44) 020 7594 0939 FAX: (+44) 020 7594 0942 EMAIL: r.newson@imperial.ac.uk WEBSITE: http://www.kcl-phs.org.uk/rogernewson/ Opinions expressed are those of the author, not of the institution.

------------------------------------------------------------------------ --------------- package somersd from c:\website\rogernewson\stata9 ------------------------------------------------------------------------ ---------------

TITLE somersd: Kendall's tau-a, Somers' D and median differences

DESCRIPTION/AUTHOR(S) The somersd package contains the programs somersd and cendif, which calculate confidence intervals for the parameters behind rank or "nonparametric" statistics. The program somersd calculates confidence intervals for Kendall's tau-a or Somers' D, and stores the estimates and their covariance matrix as estimation results. It can be used on left-censored, right-censored, clustered and/or stratified data. The program cendif calculates confidence intervals for Hodges-Lehmann median differences (or other percentile differences) between two groups. Kendall's tau-a is a difference between probabilities of concordance and discordance, and measures rank order correlation. Somers' D is a parameter equal to zero under the null hypothesis tested by the Wilcoxon-Mann-Whitney or Breslow-Gehan ranksum test, and can be used to calculate confidence intervals for Harrell's c index, for areas under receiver operating characteristic (ROC) curves, for differences between Harrell's c indices or ROC areas, or for Gini coefficients. The Hodges-Lehmann median difference can be defined in terms of Somers' D, and is also zero under the null hypothesis tested by the ranksum test. Full documentation of the two programs (including methods and formulas) can be found in the ancillary files somersd.pdf and cendif.pdf, which can be viewed using the Adobe Acrobat Reader. Author: Roger Newson Distribution-date: 26 February 2006 Stata-version: 9

INSTALLATION FILES (click here to install) somersd.ado lsomersd.mlib somersd.hlp somers_p.ado cendif.ado cendif.hlp somersd_mata.hlp mf_blncdtree.hlp mf_u2jackpseud.hlp _blncdtree.mata blncdtree.mata tidot.mata tidottree.mata _u2jackpseud.mata _v2jackpseud.mata tidotforsomersd.mata estvar1forsomersd.mata

ANCILLARY FILES (click here to get) somersd.pdf cendif.pdf ------------------------------------------------------------------------ --------------- (click here to return to the previous screen)

* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/


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