Quality and Reliability Methods - SAS

36 Statistical Control Charts Chapter 2
Display Options
Show Zones toggles between showing and not showing the zone lines. The zones are labeled A, B, and C
as shown here in the Mean plot for weight in the Coating.jmp sample data. Control Chart tests use the
zone lines as boundaries. The seven zone lines are set one sigma apart, centered on the center line.
Figure 2.10 Show Zones
Shade Zones toggles between showing and not showing the default green, yellow, and red colors for the
three zone areas and the area outside the zones. Green represents the area one sigma from the center line,
yellow represents the area two and three sigmas from the center line, and red represents the area beyond
three sigma. Shades may be shown with or without the zone lines.
Figure 2.11 Shade Zones
OC Curve gives Operating Characteristic (OC) curves for specific control charts. OC curves are defined
in JMP only for X -, P-, NP-, C-, and U-charts. The curve shows how the probability of accepting a lot
changes with the quality of the sample. When you choose the OC Curve option from the control chart
option list, JMP opens a new window containing the curve, using all the calculated values directly from
the active control chart. Alternatively, you can run an OC curve directly from the Control category of
the JMP Starter. Select the chart on which you want the curve based, then a dialog prompts you for
Target, Lower Control Limit, Upper Control Limit, k, Sigma, and Sample Size. You can also perform
both single and double acceptance sampling in the same manner. To engage this feature, choose