"Theory tells us that the aposteriori probability of a point outside three-sigma limits actually representing a real process change is approximately 90 percent. However, when you have a point between a two-sigma warning limit and a three-sigma limit, the a posteriori probability that it represents a change in your process is only about 60 percent."
Can someone point me towards how these probabilities are calculated?
The article states:
Can someone point me towards how these probabilities are calculated?