Assuming state size would be a second cut variable, New York (1 percent), California (3 percent), Ohio (6 percent), and Texas (15 percent) could be one group to study, while Kansas (less than 1 percent), Massachusetts, (2 percent), Oklahoma (6 percent), and Arizona (9 percent) could form a second group of smaller states.
The first group is composed of four states and the second group is four states as well.