Re: st: partially retrospective survival analysis

[Steven Samuels <sjhsamuels@earthlink.net>]

Alan, I wanted to add:  I don't know how to predict a prior event  
from later data.  So, ECG measurements after the fact seem useless to  
me.

-Steve
On Apr 9, 2008, at 3:23 PM, Feiveson, Alan H. (JSC-SK311) wrote:


> Hi - Has anyone seen models for or tried doing a survival analysis  
> when
> for some observations the data had been observed after the event  
> already
> occurred? For example, trying to predict time to heart attack given  
> some
> ECG measurements, but for some patients, the measurements were  
> obtained
> after the patient already had been in the hospital after the  
> attack. So
> in one sense the time to event is actually negative and censored at
> zero. Probably a better approach would be some sort of
> discrete/continuous mixture model where with a certain probability,  
> the
> event has already occurred and given that it hasn't, a standard  
> survival
> model takes effect.
>
> Al Feiveson
>
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