survfit.survTerms {psichomics}R Documentation

Compute estimates of survival curves

Description

Compute estimates of survival curves

Usage

## S3 method for class 'survTerms'
survfit(survTerms, ...)

Arguments

survTerms

survTerms object: processed survival terms

...

Arguments passed on to survival::survfit.formula

weights

The weights must be nonnegative and it is strongly recommended that they be strictly positive, since zero weights are ambiguous, compared to use of the subset argument.

subset

expression saying that only a subset of the rows of the data should be used in the fit.

na.action

a missing-data filter function, applied to the model frame, after any subset argument has been used. Default is options()$na.action.

etype

a variable giving the type of event. This has been superseded by multi-state Surv objects; see example below.

id

identifies individual subjects, when a given person can have multiple lines of data.

istate

for multi-state models, identifies the initial state of each subject

timefix

process times through the aeqSurv function to eliminate potential roundoff issues.

Value

survfit object. See survfit.object for details. Methods defined for survfit objects are print, plot, lines, and points.

Examples

clinical <- read.table(text = "2549   NA ii  female
                                840   NA i   female
                                 NA 1204 iv    male
                                 NA  383 iv  female
                               1293   NA iii   male
                                 NA 1355 ii    male")
names(clinical) <- c("patient.days_to_last_followup", 
                     "patient.days_to_death",
                     "patient.stage_event.pathologic_stage",
                     "patient.gender")
timeStart  <- "days_to_death"
event      <- "days_to_death"
formulaStr <- "patient.stage_event.pathologic_stage + patient.gender"
survTerms  <- processSurvTerms(clinical, censoring="right", event, timeStart,
                               formulaStr=formulaStr)
require("survival")
survfit(survTerms)
[Package psichomics version 1.4.5 Index]