Contingency tables are often displayed using bar charts and dot plots. These methods operate directly on tables, bypassing the need to convert them to data frames for use with the formula interface. Matrices and arrays are also supported, by coercing them to tables.
# S3 method for table
barchart(x, data, groups = TRUE,
origin = 0, stack = TRUE, ..., horizontal = TRUE)# S3 method for array
barchart(x, data, ...)
# S3 method for matrix
barchart(x, data, ...)
# S3 method for table
dotplot(x, data, groups = TRUE, ..., horizontal = TRUE)
# S3 method for array
dotplot(x, data, ...)
# S3 method for matrix
dotplot(x, data, ...)
An object of class "trellis". The
update method can be used to
update components of the object and the
print method (usually called by
default) will plot it on an appropriate plotting device.
A table, array or matrix object.
Should not be specified. If specified, will be ignored with a warning.
A logical flag, indicating whether to use the last dimension as a grouping variable in the display.
Arguments to panel.barchart. The defaults for the
table method are different.
Logical flag, indicating whether the plot should be horizontal (with the categorical variable on the y-axis) or vertical.
Other arguments, passed to the underlying formula method.
Deepayan Sarkar Deepayan.Sarkar@R-project.org
The first dimension is used as the variable on the categorical axis.
The last dimension is optionally used as a grouping variable (to
produce stacked barcharts by default). All other dimensions are used
as conditioning variables. The order of these variables cannot be
altered (except by permuting the original argument beforehand using
t or aperm). For more flexibility, use
the formula method after converting the table to a data frame using
the relevant as.data.frame method.
barchart(Titanic, scales = list(x = "free"),
auto.key = list(title = "Survived"))
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