map.density: Density plot for the cloud of individuals

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

Description

Draws a 2d density plot on top of an existing soc.ca map. The density is calculated by the kde2d function from MASS and plotted by geom_density2d from ggplot2 map.density uses the coordinates of the individuals as a basis for the density calculation. Borders are arbitrary.

Usage

map.density(
  object,
  map = map.ind(object),
  group = NULL,
  color = "red",
  alpha = 0.8,
  size = 0.5,
  linetype = "solid"
)

Arguments

object	a soc.ca class object
map	a soc.ca map object created by one of the soc.ca mapping functions
group	a factor determining group membership. Density is mapped for each group individually.
color	a single value or vector determining the color. See the scale functions of ggplot2 for ways to alter the scales.
alpha	a single value or vector determining the alpha.
size	a single value or vector determining the size of the lines.
linetype	a single value or vector determining the linetype

Examples

example(soc.ca)
map.density(result, map.ind(result, dim = 2:3, point.alpha = 0.2))
map.density(result, map.ind(result, legend = TRUE, point.alpha = 0.2),
 group = duplicated(active), color = duplicated(active),
 linetype = duplicated(active))
map.density(result, map.ctr(result))

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.