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@Article{Friendly06hesoft, author = {Michael Friendly}, title = {Data Ellipses, HE Plots and Reduced-Rank Displays for Multivariate Linear Models: SAS Software and Examples}, journal = {Journal of Statistical Software}, year = {2006}, volume = {17}, number = {6}, pages = {1–42}, url = {http://datavis.ca/papers/hesoft.pdf}, }