Annie Dudley, Senior Research Statistician, JMP
Traditionally, control charts for attribute data (p-charts and u-charts) assume the data is either binomial or Poisson, and that the mean is constant over time. However, this assumption is rarely true in practice. David Laney developed a technique that solves the problem so that control charts work well, whether the mean parameter is stable or not. This talk explains the evolution of the Laney P' and U' charts and gives examples of how best to apply them.
