legends {vcd}R Documentation

Legend Functions for Strucplots

Description

These functions generate legend functions for residual-based shadings.

Usage

legend_resbased(fontsize = 12,
  x = unit(1, "lines"), y = unit(0.1,"npc"),
  height = unit(0.8, "npc"),
  width = unit(0.7, "lines"),
  digits = 3, check_overlap = TRUE, text = NULL,
  steps = 200, ticks = 10, pvalue = TRUE)
legend_fixed(fontsize = 12, x = unit(1, "lines"), y = unit(0.2, "npc"),
  height = unit(0.8, "npc"), width = unit(1.5, "lines"),
  digits = 3, check_overlap = TRUE, text = NULL)

Arguments

fontsize fontsize of title and p-value text.
x, y objects of class "unit" indicating the coordinates of the title.
height, width object of class "unit" indicating the height/width of the legend.
digits number of digits for the scale labels.
check_overlap logical indicating whether overlap of scale labels should be inhibited or not.
text character string indicating the title of the legend.
steps granularity of the color gradient.
ticks number of scale ticks.
pvalue logical indicating whether the p-value should be visualized under the scale or not.

Details

These functions generate legend functions for residual-based shadings, visualizing deviations from expected values of an hypothesized independence model. Therefore, the legend uses a supplied shading function to visualize the color gradient for the residuals range. For more details on the shading functions and their return values, see shadings.

Value

A function with arguments:

residuals residuals from the fitted independence model to be visualized.
shading shading function computing colors from residuals (see details).
autotext character vector indicating the title to be used when no text argument is specified. Allows strucplot to generate sensible defaults depending on the residuals type.

Author(s)

David Meyer David.Meyer@R-project.org

References

D. Meyer, A. Zeileis, K. Hornik (2003), Visualizing independence using extended association plots. Proceedings of the 3rd International Workshop on Distributed Statistical Computing, K. Hornik, F. Leisch, A. Zeileis (eds.), ISSN 1609-395X. http://www.ci.tuwien.ac.at/Conferences/DSC-2003/Proceedings/

See Also

structable, shadings

Examples

mosaic(Titanic, legend = legend_resbased)
mosaic(Titanic, legend = legend_fixed)

[Package vcd version 0.9-0 Index]