Michael
use the -noadjust- option on -ltable-
from -help ltable- :
noadjust suppresses the actuarial adjustment for deaths and censored
observations. The default is to consider the
adjusted number at risk at the start of the interval to be
total at the start minus (the number dead or censored)/2.
If noadjust is specified, the number at risk is simply the
total at the start, corresponding to the standard
Kaplan-Meier assumption. noadjust should be specified when
using ltable to list results corresponding to those
produced by sts list.
Phil
At 09:51 AM 3/11/2008, you wrote:
Dear Statalist members,
I had the impression that both -ltable- and -sts list- would list
the survivor function per failure period. However, they give
slightly different answers. In the example below, for drug3
-ltable- shows survival at 24 months as 77.14%, whereas -sts list-
says it's 64.29%
sysuse cancer.dta, clear
sts list, by(drug)
ltable _t died, by(drug)
Could anyone help me to clarify this?
--
Best wishes,
Michael McCulloch
Pine Street Foundation
124 Pine St., San Anselmo, CA 94960-2674
Tel: (415) 407-1357
Fax: (415) 485-1065
[email protected]
www.pinestreetfoundation.org
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Philip Ryan
Professor,
Discipline of Public Health
Director, Data Management & Analysis Centre
Associate Dean (IT)
Faculty of Health Sciences
postal address:
Discipline of Public Health
Mail Drop DX650 511
University of Adelaide 5005
South Australia
location:
Level 6, Room 6-18
Bice Building
Royal Adelaide Hospital
North Terrace
Adelaide
tel +61 8 8303 3570
fax +61 8 8223 4075
http://www.public-health.adelaide.edu.au/
CRICOS Provider Number 00123M
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