dynpred (version 0.1.2)

toleranceplot: Create a tolerance plot

Description

Create a tolerance plot according to the methods of Henderson, Jones & Stare (2001)

Usage

toleranceplot(formula, data, coverage = 0.8, horizon, plot = TRUE, xlab)

Arguments

formula

Formula for prediction model to be used as in coxph

data

Data set in which to interpret the formula

coverage

The coverage for the tolerance intervals (default is 0.8)

horizon

The horizon, maximum value to be imputed in case of censored observations; default is 1.05 times largest event time

plot

Should the tolerance plot actually be plotted? Default is TRUE

xlab

Label for x-axis

Value

A data frame with columns

x

Predictor (centered at zero)

lower

Lower bound of tolerance interval

upper

Upper bound of tolerance interval

and with attributes "coverage" and "horizon" (copied from input or default).

Details

Warnings will be issued each time the survival curve corresponding to a value of x never goes below (1-coverage)/2; these warnings may be ignored.

References

Henderson R, Jones M & Stare J (2001), Accuracy of point predictions in survival analysis, Statistics in Medicine 20, 3083-3096.

van Houwelingen HC, Putter H (2012). Dynamic Prediction in Clinical Survival Analysis. Chapman & Hall.

Examples

data(ova)
toleranceplot(Surv(tyears, d) ~ Karn + Broders + FIGO + Ascites + Diam, data = ova)