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st: New version of -somersd- on SSC
Hello All
Thanks to Kit Baum, a new version of the -somersd- package can now be
downloaded 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 can next be updated. The new version contains the same programs
as before, but the manuals and the online help have been improved. There
are now .hlp files for all Mata programs used by -somersd- which might
possibly be useful elsewhere, and these can be accessed by typing
whelp somersd_mata
The new documentation also contains an up-to-date version of my email
address and affiliation, which has changed from King's College London to
Imperial College London (see my signature below). My old King's College
email will work until May, and my old King's College website is still
accessible, but cannot be updated. I will let the list (and StataCorp)
know the new location when my website is moved to Imperial College.
Best wishes
Roger
------------------------------------------------------------------------
-------------
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: 19 January 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)
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: [email protected]
WEBSITE: http://www.kcl-phs.org.uk/rogernewson/
Opinions expressed are those of the author, not of the institution.
*
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