An example dataset to use with the preference-based assignment model.
## `pba_gc_ex002`
A data frame with 8 rows and 2 columns.
* id: the student id of each students, simply the integers 1 to 8.
* grouping: the self-formed groups submitted by each student. In this case,
each self-formed group is of size 2.
Source
This dataset was constructed by hand.