graphs, and brushing a group of points in one plot will highlight the same points in other plots. The linking can be one-to-one, or according to the values of a categorical variable in the data set. Moving points Points in a plot can be moved interactively, e.g. to gauge results from multidimensional scaling. Add/remove points or edges. See also Data visualization Mondrian data analysis References Further reading Buja, A., D. Cook, and D.F. Swayne (March 1998). "XGobi: Interactive Dynamic Data Visualization in the X Window System". in: Journal of Computational and Graphical Statistics 7 (1): 113–130. Buja, A., D.T. Lang, and D.F. Swayne (August 28, 2003). "GGobi: Evolving From XGobi into an Extensible Framework for Interactive Data Visualization". In: Journal of Computational Statistics and Data Analysis 43 (4): 423–444. Cook, D. and D.F. Swayne (2007), with contributions from Andreas Buja, Duncan Temple Lang, Heike Hofmann, Hadley Wickham, and Michael Lawrence. Interactive and Dynamic Graphics for Data Analysis: With R and GGobi. DOI: 10.1007/978-0-387-71762-3, Springer-Verlag New York. External links GGobi Data Visualization System rggobi is an R package that interfaces R and GGobi. GGobi blog References to GGobi on the web include links at Humboldt University , Ubuntu , Debian , Freshmeat , Hugh-Public , Softpedia . Free plotting software Free statistical software