map.ellipse: Concentration ellipses

In soc.ca: Specific Correspondence Analysis for the Social Sciences

Description

Add ellipses for each level in a factor to a plot made from a soc.ca object.

Usage

map.ellipse(
  object,
  ca.plot = map.ind(object),
  variable,
  ellipse.label = TRUE,
  ellipse.color = "default",
  label.size = 4,
  draw.levels = 1:nlevels(variable),
  ellipse.line = "solid"
)

Arguments

object	is a soc.ca class object.
ca.plot	is a plot made from a soc.ca object.
variable	is a factor of the same length and in the same order as the active varibles used for the soc.ca object.
ellipse.label	if TRUE the labels are included in the map.
ellipse.color	defines the color of the ellipses. If "default" the globally defined default colors are used. Ellipse.color can be either length of 1 or equal to the number of drawn levels.
label.size	defines the size of the labels.
draw.levels	indicates the levels in the variable for which a ellipse is drawn.
ellipse.line	defines the type of line used for the ellipses.

Value

a plot with a concentration ellipse containing 80% of the individuals for each modality.

See Also

map.ind, map.ctr

Examples

example(soc.ca)
map <- map.ind(result)
map.ellipse(result, map, active[,2])

Example output

Loading required package: ggplot2

soc.ca> data(taste)

soc.ca> # Create a data frame of factors containing all the active variables 
soc.ca> taste          <- taste[which(taste$Isup == 'Active'), ]

soc.ca> attach(taste)

soc.ca> active         <- data.frame(TV, Film, Art, Eat)

soc.ca> sup            <- data.frame(Gender, Age, Income)

soc.ca> detach(taste)

soc.ca> # Runs the analysis
soc.ca> result         <- soc.mca(active, sup)

soc.ca documentation built on Sept. 5, 2021, 5:21 p.m.