I can't understand how to do a survival analysis (?Surv ()) when some
event occurred before the start of observation (left censored). If I
understand correctly, there are two methods. I chose a method with: 1)
time from the start of treatment to the event and 2) the indicator of
the event. I did (in my data) the event indicator so:
1 - event, 2 - event before the start of observation, 0 - no event
---
library(survival)
left_censor_data <- read.table("left.csv", header = TRUE, sep = ";")
#sep = ";" it's right!
dput(left_censor_data, file="left_censor_data") #file attached
left_censor_data
'data.frame': 11 obs. of 2 variables:
$ timee : int 5 151 33 37 75 14 7 9 1 45 ...
$ eventt: int 2 0 0 0 0 0 0 2 0 1 ...
# 1—event, 2 – event before the start of observation , 0 – no event
sur <- Surv(time = left_censor_data$timee, event =
left_censor_data$eventt, type = "left")
Warning message:
In Surv(time = left_censor_data$timee, event = left_censor_data$eventt, :
Invalid status value, converted to NA
#Why such a message?
#Then everything turns out wrong
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