vcd (version 1.3-2)

tile: Tile Plot

Description

Plots a tile display.

Usage

## S3 method for class 'default':
tile(x,
         tile_type = c("area", "squaredarea", "height", "width"),
         halign = c("left", "center", "right"),
         valign = c("bottom", "center", "top"),
         split_vertical = NULL,
         shade = FALSE,
         spacing = spacing_equal(unit(1, "lines")),
         set_labels = NULL,
         margins = unit(3, "lines"),
         keep_aspect_ratio = FALSE,
         legend_width = NULL,
         squared_tiles = TRUE,
         main = NULL, sub = NULL, ...)
## S3 method for class 'formula':
tile(formula, data,
  \dots, main = NULL, sub = NULL, subset = NULL, na.action = NULL)

Arguments

x

a contingency table, or an object coercible to one.

formula

a formula specifying the variables used to create a contingency table from data

data

either a data frame, or an object of class "table" or "ftable".

subset

an optional vector specifying a subset of observations to be used.

na.action

a function which indicates what should happen when the data contain NAs. Ignored if data is a contingency table.

tile_type

character string indicating how the tiles should reflect the table frequencies (see details).

halign, valign

character string specifying the horizontal and vertical alignment of the tiles.

split_vertical

vector of logicals of length $k$, where $k$ is the number of margins of x (values are recycled as needed). A TRUE component indicates that the tile(s) of the corresponding dimension should be split vertically, F

spacing

spacing object, spacing function, or corresponding generating function (see strucplot for more information).

set_labels

An optional character vector with named components replacing the so-specified variable names. The component names must exactly match the variable names to be replaced.

shade

logical specifying whether shading should be enabled or not (see strucplot).

margins

either an object of class "unit" of length 4, or a numeric vector of length 4. The elements are recycled as needed. The four components specify the top, right, bottom, and left margin of the plot, respectively. When a numeric

legend_width

An object of class "unit" of length 1 specifying the width of the legend (if any). Default: 5 lines.

keep_aspect_ratio

logical indicating whether the aspect ratio should be fixed or not. The default is FALSE to enable the creation of squared tiles.

squared_tiles

logical indicating whether white space should be added as needed to rows or columns to obtain squared tiles in case of an unequal number of row and column labels.

main, sub

either a logical, or a character string used for plotting the main (sub) title. If logical and TRUE, the name of the data object is used.

...

Other arguments passed to strucplot

Value

• The "structable" visualized is returned invisibly.

Details

A tile plot is a matrix of tiles. For each tile, either the "width", "height", "area", or squared area is proportional to the corresponding entry. The first three options allow column-wise, row-wise and overall comparisons, respectively. The last variant allows to compare the tiles both column-wise and row-wise, considering either the width or the height, respectively.

In contrast to other high-level strucplot functions, tile also accepts a table with duplicated levels (see examples). In this case, artificial dimnames will be created, and the actual ones are drawn using set_labels. Note that multiway-tables are first flattened using structable.

See Also

assoc, strucplot, mosaic, structable,

Examples

data("Titanic")

## default plot
tile(Titanic)
tile(Titanic, type = "expected")
tile(Titanic, shade = TRUE)

## some variations
tile(Titanic, tile_type = "squaredarea")
tile(Titanic, tile_type = "width", squared_tiles = FALSE)
tile(Titanic, tile_type = "height", squared_tiles = FALSE)
tile(Titanic, tile_type = "area", halign = "center", valign = "center")

## repeat levels
tile(Titanic[,,,c(1,2,1,2)])