plot.cox.zph {survival4} | R Documentation |
plot.cox.zph(x, resid=T, se=T, df=4, nsmo=40, var)
x |
result of the cox.zph function.
|
resid |
include the residuals on the plot, as well as the smooth fit. |
se |
if true, confidence bands at 2 standard errors will be added. |
df |
the degrees of freedom for the fitted natural spline. A df value of 2 leads to a linear fit. |
nsmo |
number of points used to plot the fitted spline. |
var |
the set of variables for which plots are desired. By default, plots are produced in turn for each variable of a model. Selection of a single variable allows other features to be added to the plot, e.g., a horizontal line at zero or a main title. |
a plot is produced on the current graphics device.
data(veteran) vfit <- coxph(Surv(time,status) ~ trt + factor(celltype) + karno +age, data=veteran, x=T) temp <- cox.zph(vfit) plot(temp, var=5) #Look at Karnofsy score abline(0,0, lty=3) abline( lm( temp$y[,5] ~ temp$x), lty=4) #Add the linear fit as well title(main="VA Lung Study")