2. The computer implemented method of claim 1 wherein the second event is different than the first synthetic event, and wherein the method further comprises: after comparing, modifying the first rule set to form a second rule set, wherein modifying is based at least in part on the comparison; applying the second rule set to the first cohort and the second cohort, wherein a second result is achieved, and wherein the second result comprises a third event; comparing the third event to the first synthetic event, wherein a second comparison is formed, the second comparison comprising further data that can be used to describe a second difference between the third event and the first synthetic event; and storing the second comparison.
2. The computer implemented method of claim 1 wherein the second event is different than the first synthetic event, and wherein the method further comprises: after comparing, modifying the first rule set to form a second rule set, wherein modifying is based at least in part on the comparison; applying the second rule set to the first cohort and the second cohort, wherein a second result is achieved, and wherein the second result comprises a third event; comparing the third event to the first synthetic event, wherein a second comparison is formed, the second comparison comprising further data that can be used to describe a second difference between the third event and the first synthetic event; and storing the second comparison. 3. The computer implemented method of claim 2 wherein modifying comprises deleting a first rule from the first rule set, wherein existence of the first rule reduces a probability of an approximate match between the second event and the first synthetic event.