When more than one set of data exist, a variety of statistical approaches are available.
This happens when data are collected over multiple time periods, locations, or jobs. In these instances, data can be analyzed in a variety of ways. In this context, DCI experts know how important it may be to conduct multiple events tests (e.g., Mantel-Haenszel test) as well as pattern consistency tests (e.g., Breslow- Day statistic). Interpreting the results of these complex analyses requires significant expertise.