Internal function to make the response y passed to glmnet suitable
for coxnet (i.e. glmnet with family = "cox"). Sanity checks are performed
here too.
Arguments
- y
Response variable. Either a class "Surv" object or a two-column
matrix with columns named 'time' and 'status'.
Value
A class "Surv" object.
Details
If y is a class "Surv" object, this function returns y with no changes. If
y is a two-column matrix with columns named 'time' and 'status', it is
converted into a "Surv" object.