ginimap: Lorentz curve and map
In GeoXp: Interactive exploratory spatial data analysis

Description Usage Arguments Details Value Note Author(s) References See Also Examples

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

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

`sp.obj`	object of class extending Spatial-class
`name.var`	a character; attribute name or column number in attribute table
`names.attr`	names to use in panel (if different from the names of variable used in sp.obj)
`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 FALSE, identify plotted objects (currently only working for points plots). Labels for identification are the row.names of the attribute table row.names(as.data.frame(sp.obj)).
`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

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.

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.

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

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

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.

gini

######
# data eire
require("maptools")
eire <- readShapePoly(system.file("etc/shapes/eire.shp", package="spdep")[1],
ID="names", proj4string=CRS("+proj=utm +zone=30 +units=km"))

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

# ... with options
ginimap(eire,"INCOME",criteria=(eire$pale==1),
identify=TRUE, pch=5, col="orange",
axes=TRUE, lablong="X", lablat="Y")