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st: New version of -somersd- on SSC


From   "Newson, Roger B" <r.newson@imperial.ac.uk>
To   "statalist" <statalist@hsphsun2.harvard.edu>
Subject   st: New version of -somersd- on SSC
Date   Mon, 3 Jul 2006 13:49:00 +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 described as below on my website. The new
version fixes a bug in -censlope-, encountered when the percentile
slopes are undefined (eg when all X-values are equal). -censlope-
formerly failed with an incomprehensible error message when this
happened. It now issues a warning message, and then teturns (and
displays) a confidence interval matrix with missing values for the
percentile slopes and for their confidence limits.

Best wishes

Roger


------------------------------------------------------------------------
------------
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: 27 June 2006
      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)

Roger Newson
Lecturer in Medical Statistics
EMAIL: r.newson@imperial.ac.uk
WEBSITE: http://www.imperial.ac.uk/nhli/r.newson/
TELEPHONE: +44 (0)20 7352 8121 ext 3381
FAX: To be arranged.
ADDRESS:
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute at Imperial College London
Emmanuel Kaye Building
Manresa Road
London SW3 6LR

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




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