search for: lung2

A user reported a problem with the survdiff function and the use of variables that contain a space.? Here is a simple example.? The same issue occurs in survfit for the same reason. lung2 <- lung names(lung2)[1] <- "in st"?? # old name is inst survdiff(Surv(time, status) ~ `in st`, data=lung2) Error in `[.data.frame`(m, ll) : undefined columns selected In the body of the code the program want to send all of the right-hand side variables forward to the strata() func...

...that with left truncation the ordering of individuals might change over time as the baseline hazard is no longer monotonic. So ordering based on just the linear predictors would not be appropriate but risk to t should be used (after choosing a t). Am I wrong? Example: lung$time2=lung$time/365 lung2=na.omit(lung) # the usual c-index fit1 <- coxph(Surv(time, status) ~ ph.ecog+ph.karno+pat.karno+meal.cal+wt.loss + age + sex, lung2) survConcordance(Surv(time, status) ~predict(fit1), lung2) # and the corresponding c-index for start, stop data (counting) fit2 <- coxph(Surv(age,age+time2, s...

...l at r-project.org <mailto:r-devel at r-project.org>> wrote: > > A user reported a problem with the survdiff function and the use of variables that > contain a space.? Here is a simple example.? The same issue occurs in survfit for the > same reason. > > lung2 <- lung > names(lung2)[1] <- "in st"?? # old name is inst > survdiff(Surv(time, status) ~ `in st`, data=lung2) > Error in `[.data.frame`(m, ll) : undefined columns selected > > In the body of the code the program want to send all of the right-hand sid...

...t;> >>> A user reported a problem with the survdiff function and the use of >>> variables that >>> contain a space. Here is a simple example. The same issue occurs in >>> survfit for the >>> same reason. >>> >>> lung2 <- lung >>> names(lung2)[1] <- "in st" # old name is inst >>> survdiff(Surv(time, status) ~ `in st`, data=lung2) >>> Error in `[.data.frame`(m, ll) : undefined columns selected >>> >>> In the body of the code the pro...

...at 12:55 PM, Therneau, Terry M., Ph.D. via R-devel < r-devel at r-project.org> wrote: > A user reported a problem with the survdiff function and the use of > variables that contain a space. Here is a simple example. The same issue > occurs in survfit for the same reason. > > lung2 <- lung > names(lung2)[1] <- "in st" # old name is inst > survdiff(Surv(time, status) ~ `in st`, data=lung2) > Error in `[.data.frame`(m, ll) : undefined columns selected > > In the body of the code the program want to send all of the right-hand > side variables...

...he use of >>>>> variables that >>>>> contain a space. Here is a simple example. The same issue occurs >>>>> in >>>>> survfit for the >>>>> same reason. >>>>> >>>>> lung2 <- lung >>>>> names(lung2)[1] <- "in st" # old name is inst >>>>> survdiff(Surv(time, status) ~ `in st`, data=lung2) >>>>> Error in `[.data.frame`(m, ll) : undefined columns selected >>>>> >>&gt...

...a problem with the survdiff function and the use of >>>> variables that >>>> contain a space. Here is a simple example. The same issue occurs >>>> in >>>> survfit for the >>>> same reason. >>>> >>>> lung2 <- lung >>>> names(lung2)[1] <- "in st" # old name is inst >>>> survdiff(Surv(time, status) ~ `in st`, data=lung2) >>>> Error in `[.data.frame`(m, ll) : undefined columns selected >>>> >>>> In the body...

[Please keep r-help in the cc: list] I don't quite know how to interpret the difference between specifying effort as an offset vs. as weights; I would have to spend more time thinking about it/working through it than I have available at the moment. I don't know that specifying effort as weights is *wrong*, but I don't know that it's right or what it is doing: if I were