Real Time Weight Control with SPC
Statistical Process Control is used to detect when a significant change has taken place in a process. We want to detect this change as soon as possible. What is real-time will depend on the process. All processes have variation as observed in any of their metrics but not all variation is significant from the statistical point of view. Random Variation Vs Trends: Statistical Process Control When we want to control a process by adjusting some process parameter we can make two mistakes: Over-react by adjusting when we shouldn't Under-react by failing to adjust when we should Control over-reaction A case of over-reaction is illustrated by the following example: Someone is shooting at a target and, based on the deviation of the impacts, he adjusts the gun site after each shot. The end result will be an increase of the dispersion of the impacts, therefore the adjustments will make the process worse. The correct way is, of course, to fire 5 or 6 shots without adjustments and then