Process Behavior Charts for Non-normal Data: A 30,000-foot-level Perspective
When non-normally distributed data are tracked over time at the 30,000-foot-level, process stability is to be assessed and a predictive statement provided, when appropriate. However, to make these assessments, a transformation that makes physical sense for this assessment may be needed. This article describes the use of an appropriate transformation from a physical point of view when deciding which actions or non-actions are most appropriate.