Special Control Charts for Special Applications

There are variations on the standard X-bar & R Charts which may be more appropriate in certain manufacturing situations.

Variations on the R Chart include:

• R – Monitors range within a subgroup.
• MR – Monitors range between subgroups.
• R_D – Monitors range of parameter difference.
• s – Monitors the process standard deviation.

Variation on the Chart include:

• X-Bar – Monitors the process location with subgroups.
• IX – Monitors single samples, not subgroups.
• X-Bar_d – Monitors the difference between the subgroup average and the historical process average or the nominal of the specification.
• IX_d – Monitors the difference between the individual value and the historical process average or the nominal of the specification.