Re: st: RE: Dropping observation after it has 'failed'

[Steven Samuels <sjhsamuels@earthlink.net>]

Q1 Stata's -stset- command requires that you designate an indicator  
for the event.  When you do this, Stata's survival programs will  
ignore records after the event.  This behavior can be modified if  
multiple events are possible (-time0- ).  Reread the manual section  
for -stset-.

Q2 does not make sense to me either. You seem to be saying that you  
do not want the independent variable value at time 3 to predict the  
event at time 3.  If so, what value of the variable should predict  
the event?  In the standard approach to event history analysis,  
prediction of an event at time "t" is based on covariates measured at  
t; these can include lagged values or prior values, but there must be  
something.  I can only guess that you have grouped data (events "at"  
time t, really refer to events in (t-1, t], but that you don't want  
to use an  independent variable that was measured at the end of the  
interval. If so, use the value from the prior interval.  This  leaves  
the question about what to about for events in the first interval.


Read Stephen Jenkin's fine text: http://www.iser.essex.ac.uk/teaching/ 
degree/stephenj/ec968/pdfs/ec968lnotesv6.pdf

-Steve

sjhsamuels@earthlink.net


> Anders Ryom Villadsen
>
>  I'm a relatively new Stata user doing discrete event history models
> with two questions regarding data handling. I have browsed manuals and
> the list archive but cannot seem to find an answer to my questions  
> that
> works.
> My data looks like this.
>
> id  time  event  indep1 .....
> 1    1       0        1
> 1    2       0        0
> 1    3       1        0
> 1    4       0        0
> etc.....
>
> 1) How do I drop the observation for time 4 (after org1 has 'failed')
> and it should no longer be part of my cloglog or logit models?
> 2) I want my indep var to work for two periods. How do I do that  
> without
>
> making it work for period 3?

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