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st: New version of -somersd- on SSC


From   "Newson, Roger B" <[email protected]>
To   <[email protected]>
Subject   st: New version of -somersd- on SSC
Date   Tue, 19 Jun 2007 11:33:31 +0100

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

The -somersd- package is defined as below on my website. The new version
supersedes last week's, and adds a new option -cfweight() for the
-cendif- module, defining cluster frequency weights (like the options of
the same name for the -somersd- and -censlope- commands). Cluster
frequency weights must be the same for all observations in a cluster,
and allow a single cluster (such as a pair in a matched-pairs analysis)
to represent multiple identical clusters.

I haven't yet rewritten -cendif- in Mata, which would probably speed it
up a bit with large samples, and would certainly harmonize it with
-somersd- and -censlope-. I might do this sometime under Stata 10 when I
have the time.

Best wishes

Roger


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: [email protected] 
www.imperial.ac.uk/nhli/r.newson/

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


------------------------------------------------------------------------
-------------------
package somersd from http://www.imperial.ac.uk/nhli/r.newson/stata9
------------------------------------------------------------------------
-------------------

TITLE
      somersd: Kendall's tau-a, Somers' D and percentile slopes

DESCRIPTION/AUTHOR(S)
      The somersd package contains the programs somersd, censlope and
cendif,
      which calculate confidence intervals for a range of parameters
behind
      rank or "nonparametric" statistics. somersd calculates confidence
      intervals for generalized Kendall's tau-a or Somers' D parameters,
      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. censlope is an extended version of somersd, which
also
      calculates confidence limits for the generalized Theil-Sen median
slopes
      (or other percentile slopes) corresponding to the version of
Somers' D
      or Kendall's tau-a estimated. cendif is an easy-to-use program to
      calculate confidence intervals for Hodges-Lehmann median
differences
      (or other percentile differences) between two groups. The somersd
package
      can be used to calculate confidence intervals for a wide range of
      rank-based parameters, which are special cases of Kendall's tau-a,
      Somers' D or percentile slopes. These parameters include
differences
      between proportions, Harrell's c index, areas under receiver
operating
      characteristic (ROC) curves, differences between Harrell's c
indices or
      ROC areas, Gini coefficients, population attributable risks,
median
      differences, ratios, slopes and per-unit ratios, and the
parameters
      behind the sign test and the Wilcoxon-Mann-Whitney or
Breslow-Gehan
      ranksum tests. Full documentation of the programs (including
methods and
      formulas) can be found in the manual files somersd.pdf,
censlope.pdf and
      cendif.pdf, which can be viewed using the Adobe Acrobat Reader.
      
      Author: Roger Newson
      Distribution-date: 18June2007
      Stata-version: 9
      

INSTALLATION FILES                                  (click here to
install)
      cendif.ado
      censlope.ado
      somers_p.ado
      somersd.ado
      cendif.hlp
      censlope.hlp
      censlope_iteration.hlp
      mf_bcsf_bracketing.hlp
      mf_blncdtree.hlp
      mf_somdtransf.hlp
      mf_u2jackpseud.hlp
      somersd.hlp
      somersd_mata.hlp
      _bcsf_bisect.mata
      _bcsf_bracketing.mata
      _bcsf_regula.mata
      _bcsf_ridders.mata
      _blncdtree.mata
      _somdtransf.mata
      _u2jackpseud.mata
      _v2jackpseud.mata
      blncdtree.mata
      tidot.mata
      tidottree.mata
      lsomersd.mlib

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

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