Quality and Reliability Methods - SAS

34 Statistical Control Charts Chapter 2
Tailoring the Horizontal Axis
If you check the Capability option on the Control Chart launch dialog (see Figure 2.3), a dialog appears as
the platform is launched asking for specification limits. The standard deviation for the control chart selected
is sent to the dialog and appears as a Specified Sigma value, which is the default option. After entering the
specification limits and clicking OK, capability output appears in the same window next to the control
chart. For information on how the capability indices are computed, see the Basic Analysis and Graphing
book.
Tailoring the Horizontal Axis
When you double-click the x axis, the X Axis Specification dialog appears for you to specify the format, axis
values, number of ticks, gridline and reference lines to display on the x axis.
For example, the Pickles.JMP data lists measurements taken each day for three days. In this example, by
default, the x axis is labeled at every other tick. Sometimes this gives redundant labels, as shown to the left in
Figure 2.9. If you specify a label at an increment of eight, with seven ticks between them, the x axis is labeled
once for each day, as shown in the chart on the right.
Figure 2.9 Example of Labeled x Axis Tick Marks
Display Options
Control Charts have popup menus that affect various parts of the platform:
• The menu on the top-most title bar affects the whole platform window. Its items vary with the type of
chart you select.
• There is a menu of items on the chart type title bar with options that affect each chart individually.
Single Chart Options
The popup menu of chart options appears when you click the icon next to the chart name, or context-click
the chart space (right-mouse click on Windows or Control-click on the Macintosh). The CUSUM chart has