st: New version of -somersd- on SSC

["Newson, Roger B" <r.newson@imperial.ac.uk>]

Thanks to Kit Baum, a new version of the -somersd- package is 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 adds to the -censlope- program a new option
-ystargenerate(newvarlist)-, which generates variables of the form

ystar(beta)=Y-X*beta

where Y is the Y-variable, X is the X-variable, and beta is a
generalized Theil-Sen median (or other percentile) slope. These
variables can be used to calculate the intercepts corresponding to
median slopes, conventionally defined as medians of ystar variables.
These intercepts can then be used to draw straight lines through scatter
plots. The online help, and the manual -censlope.pdf-, demonstrate how
to do this.

Best wishes

Roger


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package somersd from http://www.imperial.ac.uk/nhli/r.newson/stata9
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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 fractions,
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: 08 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
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(click here to return to the previous screen)

Roger Newson
Lecturer in Medical Statistics
TELEPHONE: (+44) 020 7594 0939
FAX: (+44) 020 7594 0942
EMAIL: r.newson@imperial.ac.uk
WEBSITE: http://www.imperial.ac.uk/nhli/r.newson/
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

SOON moving again to:
National Heart and Lung Institute at Imperial College London
Emmanual Kay Building
Manresa Road
London SW3 6LR

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

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