seq_mosaic: Sequential Mosaics and Strucplots for an N-way Table

In vcdExtra: 'vcd' Extensions and Additions

Sequential Mosaics and Strucplots for an N-way Table

Description

This function takes an n-way contingency table and plots mosaics for series of sequential models to the 1-, 2-, ... n-way marginal tables, corresponding to a variety of types of loglinear models.

Usage

seq_mosaic(
  x,
  panel = mosaic,
  type = c("joint", "conditional", "mutual", "markov", "saturated"),
  plots = 1:nf,
  vorder = 1:nf,
  k = NULL,
  ...
)

Arguments

x	a contingency table in array form, with optional category labels specified in the dimnames(x) attribute, or else a data.frame in frequency form, with the frequency variable named "Freq".
panel	a strucplot panel function, typically mosaic or sieve. NOT yet implemented.
type	type of sequential model to fit, a character string. One of "joint", "conditional", "mutual", "markov", or "saturated".
plots	which marginal sub-tables to plot? A vector of a (sub)set of the integers, 1:nf where nf is the number of factors in the full n-way table.
vorder	order of variables, a permutation of the integers 1:nf, used to reorder the variables in the original table for the purpose of fitting sequential marginal models.
k	conditioning variable(s) for type = "joint", "conditional" or Markov chain order for type = "markov"
...	other arguments passed to mosaic.

Details

This function produces similar plots to the use of mosaic.loglmlist, called with the result of seq_loglm.

Value

None. Used for its side-effect of producing plots

Author(s)

Michael Friendly

References

These functions were inspired by the original SAS implementation of mosaic displays, described in the User's Guide for Mosaics, http://www.datavis.ca/mosaics/mosaics.pdf

See Also

loglin-utilities for descriptions of sequential models, conditional, joint, mutual, ... loglmlist, mosaic.loglmlist, seq_loglm

    \code{\link{mosaic.glm}}, \code{\link[vcd]{mosaic}},
    \code{\link[vcd]{strucplot}}, for the many parameters that control the details of mosaic plots.

Examples

data(Titanic, package="datasets")

seq_mosaic(Titanic)  # models of joint independence, Survived last
seq_mosaic(Titanic, type="condit")
seq_mosaic(Titanic, type="mutual")

# other panel functions and options: presently BUGGED
## Not run: 
seq_mosaic(Titanic, type="mutual", panel=sieve,
   gp=shading_Friendly, labeling=labeling_values)

## End(Not run)

vcdExtra documentation built on Dec. 11, 2025, 9:06 a.m.