doubledecker {vcd} | R Documentation

## Doubledecker Plot

### Description

This function creates a doubledecker plot visualizing a classification rule.

### Usage

    ## S3 method for class 'formula':
    doubledecker(formula, data = NULL, ..., main = NULL)
    ## Default S3 method:
    doubledecker(x, depvar = length(dim(x)),
      margins = c(1,4, length(dim(x)) + 1, 1),
      col = rainbow_hcl(tail(dim(x), 1), end = 260),
      labeling = labeling_doubledecker,
      spacing = spacing_highlighting,
      main = NULL, keep_aspect_ratio = FALSE, ...)

### Arguments

`formula` | a formula specifying the variables used to create a contingency table from `data`. The dependent variable is used last for splitting.
`data` | either a data frame, or an object of class `"table"` or `"ftable"`.
`x` | a contingency table in array form, with optional category labels specified in the `dimnames(x)` attribute.
`depvar` | dimension index or character string specifying the dependent variable. That will be sorted last in the table.
`margins` | margins of the plot. Note that by default, all factor names (except the last one) and their levels are visualized as a block under the plot.
`col` | vector of colors used for the tiles of the last variable.
`labeling` | labeling function or corresponding generating generating function (see `strucplot` for details).
`spacing` | spacing object, spacing function or corresponding generating function (see `strucplot` for details).
`main` | either a logical, or a character string used for plotting the main title. If `main` is `TRUE`, the name of the `data` object is used.
`keep_aspect_ratio` | logical indicating whether the aspect ratio should be maintained or not.
`...` | Further parameters passed to `mosaic`.

### Details

Doubledecker plots visualize the the dependence of one categorical (typically binary) variable on further categorical variables. Formally, they are mosaic plots with vertical splits for all dimensions (antecedents) except the last one, which represents the dependent variable (consequent). The last variable is visualized by horizontal splits, no space between the tiles, and separate colors for the levels.

### Value

The `"structable"` visualized is returned invisibly.

### Author(s)

David Meyer David.Meyer@R-project.org

### References

H. Hoffmann (2001), Generalized odds ratios for visual modeling. Journal of Computational and Graphical Statistics, 10, 4, 628–640.

### See Also

`strucplot`, `mosaic`

### Examples

    doubledecker(Titanic)
    doubledecker(Titanic, depvar = "Survived")
    doubledecker(Survived ~ ., data = Titanic)

[Package vcd version 0.9-6 Index]