ginimap: Lorentz curve and map

In tibo31/GeoXp: Interactive Exploratory Spatial Data Analysis

Lorentz curve and map

Description

The function ginimap() computes a Lorentz curve from name.var and calculates the Gini Index associated to name.var.

Usage

ginimap(sf.obj, name.var, criteria = NULL,
  carte = NULL, identify = NULL, cex.lab = 0.8, pch = 16, col = "lightblue3",
  xlab = "", ylab = "", axes = FALSE, lablong = "", lablat = "")

Arguments

sf.obj	object of class sf
name.var	a character; attribute name or column number in attribute table
criteria	a vector of boolean of size the number of Spatial units, which permit to represent preselected sites with a cross, using the tcltk window
carte	matrix with 2 columns for drawing spatial polygonal contours : x and y coordinates of the vertices of the polygon
identify	if not NULL, the name of the variable for identifying observations on the map
cex.lab	character size of label
pch	16 by default, symbol for selected points
col	"lightblue3" by default, color of bars on the histogram
xlab	a title for the graphic x-axis
ylab	a title for the graphic y-axis
axes	a boolean with TRUE for drawing axes on the map
lablong	name of the x-axis that will be printed on the map
lablat	name of the y-axis that will be printed on the map

Details

Users have the possibility to choose a threshold by mouse clicking on the Lorentz curve or by specifying it in the menu. The corresponding pair (F,G) and the value of name.var are then printed on the graph and the sites with a value of name.var lower or equal to the threshold are then selected on the map.

Value

In the case where user click on save results button, a vector of integer is created as a global variable in last.select object. It corresponds to the number of spatial units selected just before leaving the Tk window.

Note

The Gini Index is given in the tcltk window (see function gini for the formula used to calculate it).

Author(s)

Thomas-Agnan C., Aragon Y., Ruiz-Gazen A., Laurent T., Robidou L.

References

Thibault Laurent, Anne Ruiz-Gazen, Christine Thomas-Agnan (2012), GeoXp: An R Package for Exploratory Spatial Data Analysis. Journal of Statistical Software, 47(2), 1-23.

See Also

gini

Examples

######
# data eire
require(sf)
eire <- st_read(system.file("shapes/eire.shp", package="spData")[1])

# a basic usage ...
ginimap(eire, "INCOME")

## Not run:  
# ... with options
ginimap(eire, "INCOME", criteria = (eire$pale == 1),
  identify = "names", pch = 5, col = "orange", 
  axes = TRUE, lablong = "X", lablat = "Y")

## End(Not run)

tibo31/GeoXp documentation built on April 8, 2023, 7:50 a.m.