On Fri, 21 May 2004, array chip wrote:
> Hi,
>
> I am wondering how to specify interval-censored data
> in coxph? The example in the help page
>
> summary(coxph(Surv(start, stop, event) ~ x, data =
> test2))
>
> is for counting process data, is the counting process
> data the same as interval-censored data?
>
No. You can't use interval-censored data in the Cox model, only in the
parametric survival models (survreg()).
There are two ways of specifying interval-censored data. In the
simpler one the syntax is Surv(before,after, type="interval2")
Here 'before' is the start of the interval and after is the end of the
interval. You can combine this with exact failure times (before==after)
and right-censoring (after=NA) and left censoring (before=NA).
-thomas
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