Follow-up Plot {epicalc}R Documentation

Longitudinal followup plot

Description

Plot longitudinal values of individuals with or without stratification

Usage

followup.plot (id, time, outcome, by = NULL, 
        n.of.lines = NULL, legend = TRUE, line.col="blue") 

Arguments

id idenfication variable of the same subject being followed up
time time at each measurement
outcome continuous outcome variable
by stratification factor if any
n.of.lines number of lines (or number of subjects in the data frame) randomly chosen for drawing
legend whether a legend will be automatically included in the graph
line.col line color(s) for non-stratified plot

Details

'followup.plot' plots outcome over time of the individual subjects.

If a stratification variable 'by' is specified, the levels of this variable will be used to color the lines.

'n.of.lines' is used to reduce the number of lines to allow the pattern to be seen more clearly.

'legend' is omitted if 'n.of.lines' is not NULL or the number of subjects exceeds 7 without stratification.

'line.col' works only for non-stratified plot. It can be a single standard color or "multicolor".

Author(s)

Virasakdi Chongsuvivatwong <cvirasak@medicine.psu.ac.th>

See Also

'plot','lines'

Examples

use(Indometh)
followup.plot(Subject, time, conc)

library(MASS)
use(Sitka)
followup.plot(tree, Time, size)
followup.plot(tree, Time, size, line.col = "brown")
followup.plot(tree, Time, size, line.col = "multicolor")
followup.plot(tree, Time, size, n.of.lines=20, line.col = "multicolor")


# Breakdown of color by treatment group
followup.plot(tree, Time, size, by=treat)

# The number lines reduced to 40
followup.plot(tree, Time, size, by=treat, n.of.lines=40)

[Package epicalc version 2.4.0.11 Index]