Advice

If the probability of the adverse event you are monitoring is very low (less than 5%), consider examining time-between charts.  Otherwise, you need a P-chart to analyze your data.  Time in between charts require less data than P-charts.

This page was last revised on 05/03/2015 by Farrokh Alemi, Ph.D.  This guide to control charts is part of the course on Quality / Process Improvement.