12. The computer program product of claim 11 wherein the second event is different than the first synthetic event, and wherein the computer program product further comprises: instructions for, after comparing, modifying the first rule set to form a second rule set, wherein modifying is based at least in part on the comparison; instructions for 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; instructions for 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 instructions for storing the second comparison.
12. The computer program product of claim 11 wherein the second event is different than the first synthetic event, and wherein the computer program product further comprises: instructions for, after comparing, modifying the first rule set to form a second rule set, wherein modifying is based at least in part on the comparison; instructions for 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; instructions for 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 instructions for storing the second comparison. 13. The computer program product of claim 12 further comprising: instructions for iteratively performing modifying the first rule set, applying the second rule set, comparing the third event, and storing the second comparison, wherein at each iteration a different rule set, a different event, and a different comparison are created, and wherein iteration continues until a last event is approximately equivalent to the first synthetic event.