ggfitStrata: Graph fitted stratified survival curves

In christophergandrud/simtvc: Tools for simulating and graphing time-varying hazards.

Description

This function largely improves plot.survfit. It plots the curves using ggplot2 rather than base R graphics. One major advantage is the ability to split the survival curves into multiple plots and arrange them in a grid. This makes it easier to examine many strata at once. Otherwise they can be very bunched up.

Note: the strata legend labels need to be changed manually (see revalue) in the survfit object with the strata component.

Usage

  ggfitStrata(obj, byStrata = FALSE, xlab = "", ylab = "",
    title = "", lcolour = "#2C7FB8", rcolour = "#2C7FB8")

Arguments

obj	a survfit object.
byStrata	logical, whether or not you want to include all of the stratified survival curves on one plot or separate them into a grid arranged plot.
xlab	a label for the plot's x-axis
ylab	a label of the plot's y-axis
title	plot title.
lcolour	line color. Currently only works if byStrata = TRUE. The default it lcolour = "#2C7FB8" (a bluish hexadecimal colour)
rcolour	confidence bounds ribbon color. Either a single color or a vector of colours. The default it lcolour = "#2C7FB8" (a bluish hexadecimal colour)

Details

ggfitStrata graphs fitted survival curves created with survfit using ggplot2.

See Also

survfit, ggplot2 and strata

Examples

# Load survival
library(survival)
# Subset data
bladder1 <- bladder[bladder$enum < 5, ]
# Estimate coxph model
M1 <- coxph(Surv(stop, event) ~ (rx + size + number) * strata(enum) + cluster(id), bladder1)
# Survfit
M1Fit <- survfit(M1)
# Plot strata in a grid
ggfitStrata(M1Fit, byStrata = TRUE)

christophergandrud/simtvc documentation built on May 13, 2019, 7:03 p.m.