Visualizing Collinearity Diagnostics

Collinearity biplot	Tableplot

This web page provides supplementary materials associated with the article, Where's Waldo: Visualizing Collinearity Diagnostics, Michael Friendly & Ernest Kwan, The American Statistician, 2009, 63(1), 56-65.

It provides the following:

Software

• SAS software (links to documentation and download).  See the general page, www.datavis.ca/sasmac/ for other macros.
• biplot macro
• outlier macro
• inflplot macro
• R software: 
• R package tableplot on CRAN
• Original ZIP archive of tableplot programs and examples: tableplot.zip
• Matlab users:  See the page by Brian Lau, Matlab code for diagnosing collinearity in a regression design matrix.

Examples and scripts:

Cars data

• Collinearity biplots and related displays for outliers [vis-outlier.pdf]
• data file [cars.csv]
• SAS input source file [cars2.sas]
• SAS: Collinearity biplots [cars-biplot3.sas]
• R: Collinearity diagnostics, tableplot, biplot [cars-colldiag-ex.R]

Biomass data:

• data file [linthall.dat]
• SAS input source file [linthall.sas]
• SAS: Collinearity biplots [linth2.sas]
• R: Collinearity diagnostics, tableplot, biplot [linth-colldiag-ex.R]

Baseball data:

• Description, analyses and figures [vis-extra.pdf]
• data file [baseball.csv]
• SAS input source file: [baseball.sas]
• SAS: collinearity biplot [base-biplot.sas]
• R: Collinearity diagnostics, tableplot, biplot [base-colldiag-ex.R]