Doubly interval-censored data

Have you looked at library(survival)?  Unless I misunderstand what you
want, it should be there

.  Further documentation is provided in Venables
and Ripley (2002) Modern Applied Statistics with W, Therneau and
Grambsch (2000) Modeling Survival Data, Harrell (2001) Regression
Modeling Strategies (all Springer), and in materials downloadable from
www.r-project.org;  see especially search -> "R site search".  Have you
tried these sources?

      hope this helps.  spencer graves

Salah Mahmud wrote:

Does anyone know of the existence of R code for estimating the survivor
function and its standard error where survival time (T) is defined as
the time between two interval-censored events, i.e., both events are
only known to occur within an interval? This is the situation that
commonly arises in longitudinal studies of viral infections. For
instance T could be the time of clearing HPV infection when the dates of
acquisition and loss (clearance) of infection are not measured exactly
but known to occur between two consecutive dates (dates of prescheduled
follow-up visits).

Many thanks,

Salah