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Latticist provides a graphical user interface for exploratory visualisation. It is primarily an interface to the Lattice graphics system, but also produces displays from the vcd package for categorical data. Given a multivariate dataset (either a data frame or a table), latticist attempts to produce useful displays based on the properties of the data. The displays can be customised by editing the calls used to generate them.
I have become quite a big fan of graphics that combine the features of traditional figures (e.g. bar charts, histograms, etc.) with tables. That is, the combination of numerical results with a visual representation has been quite useful for exploring descriptive statistics. I have wrapped two of my favorites (build around ggplot2) and included them as part of my irutils R package (currently under development). Here is the code and results utilizing two item from the 2009 Programme of International Student Assessment (PISA).