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st: should I or shouldn"t I use _time0(var)_ for left truncation (delayed entry)?
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From |
"josemaria" <[email protected]> |
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To |
<[email protected]> |
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Subject |
st: should I or shouldn"t I use _time0(var)_ for left truncation (delayed entry)? |
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Date |
Fri, 29 Dec 2006 17:23:16 -0200 |
Dear statalisters:
the manuals and the help for stset say that _time0 ()_ "is rarely
specified... and should be used exclusively with multiple-record data, and
even then it should be considered whether _origin()_ or _enter()_ would be
more appropriate". However, the book An Introduction to Survival Analysis
Using Stata, by Cleves, Gould & Gutierrez, first edition, on pages 92-94,
shows the use of _time0()_ for left truncation (delayed entry) and not for
multiple-record data. Can the _stcox_ command be used to complete the
analysis ? I have a data set with a situation alike the example (subjets
enter at several different times to form the risk sets) and I am at lost
with the options for stset.
Thank for the help,
Jos� Maria
Jos� Maria Pacheco de Souza, Professor Titular (aposentado)
Departamento de Epidemiologia
Faculdade de Sa�de P�blica/Universidade de S�o Paulo
Av. Dr. Arnaldo, 715 cep 01246-904
S�o Paulo Brasil
fones (11)3082-3886 (11)3061-7724 (11)3714-2403 (11)3768-8612
fax (11)3082-2920 (11)3714-2403
www.fsp.usp.br/~jmpsouza
[email protected]
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