Re: st: finding the last observation in a survival dataset

[Steven Samuels <sjhsamuels@earthlink.net>]

Michael,

That will be the "time" variable in your -stset- command. If you have  
multiple-time observations, it is the highest one.

-Steven
On Apr 27, 2008, at 2:21 PM, Michael McCulloch wrote:


> Sorry Maarten that I didn't fully explain my question. I will be  
> estimating the probability of being censored using a Cox  
> regression, with
> 	dependent variable: C==0/1 in the last observation time for each  
> subject
> 	predictor variables: baseline covariates
> It's for the method by Robins, 2000 called "Inverse Probability of  
> Censoring Weighting."
> That's why I want to find the last observation time for each subject.
> Michael
>
>
>
> > -stdes- will give you that proportion.
> >
> > -- Maarten
> >
> > --- Michael McCulloch <mm@pinest.org> wrote:
> >
> > >  Hi,
> > >  I would like to learn how to identify the last observation of each
> > >  individual subject within a longitudinal data set.
> > >
> > >  I'm using the hip2.dta  data set, and have run _stsplit_  to create
> > >  one observation per failure time for each subject. Note that  
> > > subject
> > >  id==1 observed a failure during observation time, whereas subject
> > >  id==48 did not.
> > >
> > >  use hip2.dta, clear
> > >  stsplit, at(failures) riskset(riskid)
> > >  sort id time0
> > >  list id time0 time1 protect fracture if id==1 | id==48
> > >
> > >  In order to estimate a subject's probability of being censored, I
> > >  will create a new variable, C, which is equal to zero for a  
> > > subject's
> > >
> > >  last failure time if the subject was not censored, and is equal to
> > >  one subject was censored.
> > >
> > >  How can I identify the last observation of each individual subject
> > >  within a longitudinal data set, so that I can create my new  
> > > variable
> > >  without having to manually search for that last observation?
> > >
> > >
> > >  --
> > >
> > >  Best wishes,
> > >  Michael McCulloch
> > >
> > >
> > >
> > >  Pine Street Foundation
> > >  124 Pine St., San Anselmo, CA 94960-2674
> > >  Tel:	(415) 407-1357
> > >  Fax:	(415) 485-1065
> > >  mcculloch@pinestreetfoundation.org
> > >  www.pinestreetfoundation.org
> > >  *
> > >  *   For searches and help try:
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> >
> > -----------------------------------------
> > Maarten L. Buis
> > Department of Social Research Methodology
> > Vrije Universiteit Amsterdam
> > Boelelaan 1081
> > 1081 HV Amsterdam
> > The Netherlands
> >
> > visiting address:
> > Buitenveldertselaan 3 (Metropolitan), room Z434
> >
> > +31 20 5986715
> >
> > http://home.fsw.vu.nl/m.buis/
> > -----------------------------------------
> >
> >
> >       __________________________________________________________
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