Add strata to a Surv object
Helper function to add strata as an attribute to a Surv object. The
output of this function can be used as the response in glmnet()
for fitting stratified Cox models.
stratifySurv(y, strata = rep(1, length(y)))
y |
A Surv object. |
strata |
A vector of length equal to the number of observations in y, indicating strata membership. Default is all belong to same strata. |
When fitting a stratified Cox model with glmnet(), strata should
be added to a Surv response with this helper function. Note that
it is not sufficient to add strata as an attribute to the Surv
response manually: if the result does not have class stratifySurv,
subsetting of the response will not work properly.
An object of class stratifySurv (in addition to all the
classes y belonged to).
y <- survival::Surv(1:10, rep(0:1, length.out = 10)) strata <- rep(1:3, length.out = 10) y2 <- stratifySurv(y, strata) # returns stratifySurv object
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