EVSI for a New Study
The expected value of the optimal decision given current information is the value of the decision option that maximizes expected net benefit and can therefore be considered cost-effective,
A new study would provide data The expected value of the optimal decision made after collecting 
The value of collecting The expected value of the decision made with additional sample information is given by
The EVSI
In the next section, we describe the EVSI estimation procedure for collecting time-to-event data.