joineR (version 1.0-2)

points.jointdata: Add points to an existing jointdata plot

Description

Add points to an existing plot of an object of class jointdata, for a longitudinal variable. It is possible plot all the subjects in the data set, or just a selected subset. See subset.jointdata

Usage

## S3 method for class 'jointdata':
points(x, Y.col, \dots)

Arguments

x

object of class jointdata

Y.col

column number, or column name, of longitudinal variable to be plotted

...

other graphical arguments

Value

• A graphical device with a plot for longitudinal data. Other functions are useful to be used with this as plot and lines

Examples

data(heart.valve)
heart.surv <- UniqueVariables(heart.valve, var.col = c("fuyrs", "status"), 
      id.col = "num")
heart.long <- heart.valve[, c(1, 4, 5, 7, 8, 9, 10, 11)]
heart.jd <- jointdata(longitudinal = heart.long, 
      survival = heart.surv, id.col = "num", time.col = "time")
# Randomly select a pair of subjects to plot profiles of
take <- sample(1 : max(heart.jd$survival$num), 2)
heart.jd.1 <- subset(heart.jd, take[1])
heart.jd.2 <- subset(heart.jd, take[2])
plot(heart.jd.1, Y.col = "grad", type = "p")
points(heart.jd.2, Y.col = "grad", col = "blue", pch = 20)