If you want to customize ROC curves, one possibility is to use the
-senspec- package, downloadable from SSC, for calculating sensitivities
and specificities, and then to use -graph twoway- to produce the plots
in any way that you wish. To compare ROC areas, you can use the
-somersd- package, downloadable from SSC, to estimate ROC areas and
their differences, with confidence limits (not just P-values). A
reference on how to do this is Newson (2002), downloadable from my
website (see my signature below).
I hope this helps.
Roger
References
Newson R. Parameters behind "nonparametric" statistics: Kendall's tau,
Somers' D and median differences. The Stata Journal 2002; 2 (1): 45-64.
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.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Steinar
Fossedal
Sent: 04 February 2006 19:09
To: [email protected]
Subject: st: msize with roccomp
Is there any way to have stata accept the -msize- option for -roccomp-?
The normal size dots are rather large and cross over eachother once you
have more than one of them in a plot at any time.
Thanks,
Steinar
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