User blog comment:HeresyHorus/Critical Strike Chance/@comment-13372515-20140415193227

The third point is wrong. While it is true that landing non-crits on creeps will improve your chances of landing a crit later on a champion, it will work for one and single crit ONLY. The PRD resets to a fixed value based on your actual chance after every crit. The whole point of PRD is to reduce the probability of effects happening many times in a row, be it scoring a crit or not scoring one.