| mosaicplot {graphics} | R Documentation |
Plots a mosaic on the current graphics device.
mosaicplot(x, ...)
## Default S3 method:
mosaicplot(x, main = deparse(substitute(x)),
sub = NULL, xlab = NULL, ylab = NULL,
sort = NULL, off = NULL, dir = NULL,
color = NULL, shade = FALSE, margin = NULL,
cex.axis = 0.66, las = par("las"), border = NULL,
type = c("pearson", "deviance", "FT"), ...)
## S3 method for class 'formula'
mosaicplot(formula, data = NULL, ...,
main = deparse(substitute(data)), subset,
na.action = stats::na.omit)
x |
a contingency table in array form, with optional category
labels specified in the |
main |
character string for the mosaic title. |
sub |
character string for the mosaic sub-title (at bottom). |
xlab, ylab |
x- and y-axis labels used for the plot; by default,
the first and second element of |
sort |
vector ordering of the variables, containing a permutation
of the integers |
off |
vector of offsets to determine percentage spacing at each level of the mosaic (appropriate values are between 0 and 20, and the default is 20 times the number of splits for 2-dimensional tables, and 10 otherwise). Rescaled to maximally 50, and recycled if necessary. |
dir |
vector of split directions ( |
color |
logical or (recycling) vector of colors for color
shading, used only when |
shade |
a logical indicating whether to produce extended mosaic
plots, or a numeric vector of at most 5 distinct positive numbers
giving the absolute values of the cut points for the residuals. By
default, |
margin |
a list of vectors with the marginal totals to be fit in
the log-linear model. By default, an independence model is fitted.
See |
cex.axis |
The magnification to be used for axis annotation,
as a multiple of |
las |
numeric; the style of axis labels, see |
border |
colour of borders of cells: see |
type |
a character string indicating the type of residual to be
represented. Must be one of |
formula |
a formula, such as |
data |
a data frame (or list), or a contingency table from which
the variables in |
... |
further arguments to be passed to or from methods. |
subset |
an optional vector specifying a subset of observations in the data frame to be used for plotting. |
na.action |
a function which indicates what should happen
when the data contains variables to be cross-tabulated, and these
variables contain |
This is a generic function. It currently has a default method
(mosaicplot.default) and a formula interface
(mosaicplot.formula).
Extended mosaic displays visualize standardized residuals of a loglinear model for the table by color and outline of the mosaic's tiles. (Standardized residuals are often referred to a standard normal distribution.) Cells representing negative residuals are drawn in shaded of red and with broken borders; positive ones are drawn in blue with solid borders.
For the formula method, if data is an object inheriting from
class "table" or class "ftable" or an array with more
than 2 dimensions, it is taken as a contingency table, and hence all
entries should be non-negative. In this case the left-hand side of
formula should be empty and the variables on the right-hand
side should be taken from the names of the dimnames attribute of the
contingency table. A marginal table of these variables is computed,
and a mosaic plot of that table is produced.
Otherwise, data should be a data frame or matrix, list or
environment containing the variables to be cross-tabulated. In this
case, after possibly selecting a subset of the data as specified by
the subset argument, a contingency table is computed from the
variables given in formula, and a mosaic is produced from
this.
See Emerson (1998) for more information and a case study with television viewer data from Nielsen Media Research.
Missing values are not supported except via an na.action
function when data contains variables to be cross-tabulated.
A more flexible and extensible implementation of mosaic plots written
in the grid graphics system is provided in the function
mosaic in the contributed package vcd
(Meyer, Zeileis and Hornik, 2006).
S-PLUS original by John Emerson john.emerson@yale.edu. Originally modified and enhanced for R by Kurt Hornik.
Hartigan, J.A., and Kleiner, B. (1984). A mosaic of television ratings. The American Statistician, 38, 32–35. doi: 10.2307/2683556.
Emerson, J. W. (1998). Mosaic displays in S-PLUS: A general implementation and a case study. Statistical Computing and Graphics Newsletter (ASA), 9, 1, 17–23.
Friendly, M. (1994). Mosaic displays for multi-way contingency tables. Journal of the American Statistical Association, 89, 190–200. doi: 10.2307/2291215.
Meyer, D., Zeileis, A., and Hornik, K. (2006) The strucplot Framework: Visualizing Multi-Way Contingency Tables with vcd. Journal of Statistical Software, 17(3), 1–48. doi: 10.18637/jss.v017.i03.
require(stats) mosaicplot(Titanic, main = "Survival on the Titanic", color = TRUE) ## Formula interface for tabulated data: mosaicplot(~ Sex + Age + Survived, data = Titanic, color = TRUE) mosaicplot(HairEyeColor, shade = TRUE) ## Independence model of hair and eye color and sex. Indicates that ## there are more blue eyed blonde females than expected in the case ## of independence and too few brown eyed blonde females. ## The corresponding model is: fm <- loglin(HairEyeColor, list(1, 2, 3)) pchisq(fm$pearson, fm$df, lower.tail = FALSE) mosaicplot(HairEyeColor, shade = TRUE, margin = list(1:2, 3)) ## Model of joint independence of sex from hair and eye color. Males ## are underrepresented among people with brown hair and eyes, and are ## overrepresented among people with brown hair and blue eyes. ## The corresponding model is: fm <- loglin(HairEyeColor, list(1:2, 3)) pchisq(fm$pearson, fm$df, lower.tail = FALSE) ## Formula interface for raw data: visualize cross-tabulation of numbers ## of gears and carburettors in Motor Trend car data. mosaicplot(~ gear + carb, data = mtcars, color = TRUE, las = 1) # color recycling mosaicplot(~ gear + carb, data = mtcars, color = 2:3, las = 1)