David Meyer, Achim Zeileis and Kurt Hornik
Visualizing Independence Using Extended Association and Mosaic Plots
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Two visualization techniques for the independence problem in 2-way contingency
tables---assocation and mosaic plots---are extended in two directions:
  1. The visualization is enhanced by displaying the significance of an
     appropriate test for independence and by using improved color schemes.
  2. The implementation in the \textsf{R} system is improved using a more
     modular design and allowing for more flexible specification of plotting
     parameters.
Furthermore, some enhancements for displays of various types of independence in
general multi-way tables are suggested.