[R] Survival analysis with truncated data.

Nicolas Palix nicolas.palix at imag.fr
Wed Nov 13 15:48:32 CET 2013


I would like to know how to handle truncated data.
My intend is to have the survival curve of a software fault in order
to have some information
about fault lifespan.

I have some observations of a software system between 2004 and 2010.
The system was first released in 1994.
The event considered is the disappearance of a software fault. The
faults can have been
introduced at any time, between 1994 and 2010. But for fault
introduced before 2004,
there is not mean to know their age.

I used the Surv and survfit functions with type interval2.
For the faults that are first observed in 2004, I set the lower bound
to the lifespan
observed between 2004 and 2010.

How could I set the upper bound ? Using 1994 as a starting point to not seems
to be meaningful. Neither is using only the lower bound.

Should I consider another survival estimator ?

Thanks in advance.
Nicolas Palix
Tel: +33 4 76 51 46 27

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