data sets to work up into case study

[dicook]

• PISA: plausible scores reading, math and science and work into PCA, and possibly LDA when country (school type, continent) is used? (Di)
• sketches: dimension reduction, and classification (Stuart)
• clustering example (Ursula)

[dicook]

• Add data to mulgar package, and vignette explaining how it was created
• Add functions for PCA to mulgar, screeplot and biplot
• Animations with gif ski? Alternative with a set of still plots for pdf