Applying rules to a Shewhart control chart

Apply advanced rules to increase the sensitivity of a Shewhart control chart to detect small shifts, drift, and other patterns.

1. Activate the analysis report worksheet.
2. On the Analyse-it ribbon tab, in the Process Control group, click Apply Rules, and then click:

   Option	Description
   Standard	Apply the standard action rule only.
   WECO	Apply the original 4 rules defined by the Western Electric CO.
   Nelson	Apply the 8 rules suggested by Lloyd S. Nelson.
   Montgomery	Apply the 8 Nelson rules as modified by Douglas C. Montgomery.
   Custom	Apply a user-defined set of rules.

   The analysis task pane Control Chart (Shewhart) panel opens.
3. Optional: To customize which rules to apply, select or clear the check boxes alongside the rules.
4. Optional: To change either or both the Run length, and Sigma in a custom ruleset, type the new value in the edit box(es) alongside the rules.
5. Optional: To standardize the quality characteristic statistic, so the control limits are constant regardless of the size of each subgroup, select the Standardized plot check box.
6. Optional: To show ±1,2,3 sigma zones for interpreting rules, select the Zones check box.
7. Click Recalculate.