1. A method, comprising: obtaining a first probability distribution for a first group of users, the first group of users comprising at least two users, and a second probability distribution for a second group of users, the second group of users comprising at least two users; determining an intersection of the first probability distribution and of the second probability distribution; selecting a cohort of users associated with a value for an engagement metric based at least in part on the intersection; and comparing behavior of the first and second groups based at least in part on the selected cohort of users; wherein at least the determining, selecting, and comparing are performed via one or more computing platforms.