How to remove variables from an R formula -

How to remove variables from an R formula -

i'm trying write next formula:

everything_time <- system.time(everything_rsf <- rfsrc( surv(time = pfs, event = censoring, type = c("right")) ~.-c(sample.id,patientid,uniqueid,pfs,censoring), info = data_endogenous))

as can see, remove whole bunch of variables. yet, when everything_rsf$importance, still have sample.id, patientid, uniqueid in model. i'm not sure why.

i've tried listing them out individually well.

thanks!

formula won't take list or vector arguments, string created.

data(iris) fmla <- as.formula(paste("species ~", paste(c(".","sepal.length","petal.width"), collapse = " - "))) glm(fmla, info = iris, family = binomial(link = "logit"))

specific predictors can defined too.

data(iris) fmla <- as.formula(paste("species ~", paste(grep("width", names(iris), value = true), collapse = " + "))) glm(fmla, info = iris, family = binomial(link = "logit"))

can combine these methods removing , adding predictors desired, while leaving dataset alone. can useful when making multiple models same dataset.

r