Displaying 1 result from an estimated 1 matches for "daysbefore2c".
2005 Jul 18
1
Survival dummy variables and some questions
...turn the variables into factors and then try the analysis.
E.g.,
Dataset <- read.table("categ.dat", header=TRUE)
Dataset$eventbefore2c <- factor(Dataset$eventbefore)
.. other IVs here
...
surv.mod1 <- coxph(Surv(start, stop, event) ~ sex2 + ageonset2c +
eventbefore2c + daysbefore2c, data=Dataset)
Strangely enough, I receive a warning message when the variables are
treated in this way: X matrix deemed to be singular; variable 11 in:
coxph(Surv(start, stop, event) ~ sex2 + ageonset2c + eventbefore2c +
I don’t receive any warnings just treating the variables in their
i...