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@Misc{Friendly-etal2011carme, author = {Michael Friendly and Heather Turner and David Firth and Achim Zeileis}, title = {Advances in Visualizing Categorical Data Using the vcd, gnm and vcdExtra Packages in R}, year = {2011}, month = {feb}, howpublished = {Correspondence Analysis and Related Methods (CARME 2011)}, note = {Rennes, France}, url = {http://www.datavis.ca/papers/adv-vcd-4up.pdf}, }