[R] (no subject)

[Moustafa ElHousinie]

I have data on disappearance of virus C from blood of acutely infected
    humans.  Blood samples were taken approximately 2, 3 and 6 months after 
the
    expected date of exposure.  It is noted that :
    1- not all timepoints are available
    2- in few cases the person turned negative early (2-3 months) to turm 
back
    to positive after 6 months
    3- the definition of spontaneos clearance is not well established but
    usually treatement, if any, should be started if the person remain 
positive
    after 5-6 months from exposure
    the questions are:
    is this a logistic regression problem or time to event (lifetable 
analysis)
    problem? and in either case HOW to proceed with R
    thanks in advance
    Mostafa