Quality and Reliability Methods - SAS

Chapter 4 Interactive Control Charts 63
Example Using Control Chart Builder
From the Average chart, you can conclude the following:
• There are differences between the cavities, each deserving separate control limits.
• Cavity 1 is producing sockets with a higher average thickness, indicating that further investigation of the
differences between cavities is warranted.
• All of the cavities have points that are outside the control limits. Therefore, you should investigate the
lack of control in the data for each cavity.
The Range chart for each cavity shows that the within-subgroup measurements are in control.
Launch Control Chart Builder
Launch Control Chart Builder by selecting Analyze > Quality and Process > Control Chart Builder.
Figure 4.4 Initial Control Chart Builder Window
To begin creating a control chart, drag and drop variables from the Select Columns box into the zones.
Control Chart Builder contains the following zones:
Y
assign the process variable here. This variable should be continuous.
Subgroup assigns subgroup variables. To define subgroup levels as a combination of multiple columns,
add multiple variables to the Subgroup zone. When a subgroup variable is assigned, each point on the
control chart corresponds to a summary statistic for all of the points in the subgroup.