The bank dataset we analyze in the first part
of Chapter 3 comes from Flury and Riedwyl (1988) and
is made of four measurements on 100 genuine Swiss banknotes and 100 counterfeit ones.
The response variable \(y\) is thus the status of the banknote, where 0 stands
for genuine and 1 stands for counterfeit, while the explanatory factors are bill
measurements.