Message-ID: <CAAxaTiPcgObfJFK6OkXzeM-5ipZK8C94NSL+6B05k3LYxn77jg@mail.gmail.com>
Date: 2013-11-13T14:48:32Z
From: Nicolas Palix
Subject: Survival analysis with truncated data.
Hi,
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
http://membres-liglab.imag.fr/palix/