summary.survexp {survival}  R Documentation 
Returns a list containing the values of the survival at specified times.
## S3 method for class 'survexp' summary(object, times, scale = 1, ...)
object 
the result of a call to the 
times 
vector of times; the returned matrix will contain 1 row for each time. Missing values are not allowed. 
scale 
numeric value to rescale the survival time, e.g., if the input data to

... 
For future methods 
A primary use of this function is to retrieve survival at fixed time points, which will be properly interpolated by the function.
a list with the following components:
surv 
the estimate of survival at time t. 
time 
the timepoints on the curve. 
n.risk 
In expected survival each subject from the data set is matched to a hypothetical person from the parent population, matched on the characteristics of the parent population. The number at risk is the number of those hypothetical subject who are still part of the calculation. 
Terry Therneau