Notation for equivalence classes. This example shows a PUMF with 4 equivalence classes sampled from a population data set with 5 equivalence classes. The PUMF set has four elements: [50, Male], [50, Female], [35, Male], [35, Female]. The f
denote the equivalence class sizes for the PUMF and DAD population data sets respectively. Note that in this example f
5 = 0.