Charles Berry pointed out an error in my reasoning. In the current survival I
forgot the
S3method line for length in the NAMESPACE file, so the behavior is really not
new.
Nonetheless it remains surprising and non-intuitive. Why does model.response
sometimes
attach spurious names, when the Surv object itself does not have them?
Terry
tmt% R --vanilla
R version 3.4.2 (2017-09-28) -- "Short Summer"
test <- data.frame(time=1:8, status=rep(0:1, 4), age=60:67)
row.names(test) <- letters[1:8]
library(survival)
mf2 <- model.frame(Surv(time, status) ~ age, data=test)
names(mf2[[1]])
# NULL
names(model.response(mf2))
# NULL
length.Surv <- survival:::length.Surv
names(model.response(mf2))
# [1] "a" "b" "c" "d" "e" "f" "g" "h" NA NA NA NA NA NA NA NA
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