Each Analysis of Means Methods option adds a chart to the report window that shows the following:
• an upper decision limit (UDL)
• a lower decision limit (LDL)
• a horizontal (center) line that falls between the decision limits and is positioned as follows:
– ANOM: the overall mean
– ANOM with Transformed Ranks: the overall mean of the transformed ranks
– ANOM for Variances: the root mean square error (or MSE when in variance scale)
– ANOM for Variances with Levene (ADM): the overall absolute deviation from the mean
– ANOM for Ranges: the mean of the group ranges
If a group’s plotted statistic falls outside of the decision limits, then the test indicates that there is a statistical difference between that group’s statistic and the overall average of the statistic for all the groups.