mplot function

Plot multiple growth curves

Function to plot multiple growth curves indexed by subject id.

mplot(x, y, id, data = parent.frame(), subset = NULL, add = FALSE, ...)

Arguments

• x: vector of x coordinates.
• y: vector of y coordinates.
• id: factor denoting subject levels.
• data: optional dataframe containing x, y and id.
• subset: optional logical defining a subset of rows in data.
• add: optional logical defining whether the plot is pre-existing (TRUE) or new (FALSE).
• ...: Further graphical parameters (see par) may also be supplied as arguments, particularly background colour bg, character expansion cex, colour col, line type lty, line width lwd and character pch.

Details

The arguments x, y and id can be given as character strings. The par parameters can be functions of vector variables in data, e.g. to colour curves separately by id use: col = id.

Examples

mplot(age, height, id, heights, col=id)

Author(s)

Tim Cole tim.cole@ucl.ac.uk