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.