Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Illustration of a patient's longitudinal profile up to time 
, and conditional
survival function for whom we wish to plan an extra measurement. Physicians
are interested in events occurring within the time interval 
. Constant 
defines the
threshold above which the physician requires extra information before making a
decision.
