Intuitively it seems very improbable that the data would jump to zero, but I would like to be able to demonstrate this with some level of confidence and don't know where to start. If I plot P(i) against P(i+1) (for example) there is a clear gap between the zero and non-zero points. But what if the gap was small or a bit fuzzy making zero seem more plausible? How could I differentiate between spurious zeros and legitimate ones?