Attribute Charts Results - Specs Tab

Control Charts for Variables vs. Charts for Attributes

Select the Specs tab of the Results dialog box to access the options described here.

Specifications for X-chart.

Set << >>
If you have more than one set, these buttons will be active and can be used to select which set you are working with.
Center
Click this button to display the Chart center line dialog box. Use the options in this dialog to select the value of the center line of the respective chart instead of the default process mean value.
UCL, LCL
Click these buttons to display the Control limit dialog box. Use the options in this dialog to change the value of the Upper and Lower Control Limits from their default values of plus/minus 3 times sigma. The UCL (upper control limit) and the LCL (lower control limit) define the lines in the chart that are used to determine whether or not a particular sample statistic, and thus the entire process, is in control.  
Warning Lines
Click this button to display the Warning lines dialog box, which is used to specify warning lines. Warning limits are often established to alert the quality control engineer if minor deviations from the center line occur in some samples. Note that the specification of warning lines will pertain to all sets (if multiple sets are specified).
If Unequal n
Use this box to specify whether to base the chart on the average sample sizes (Use average n), to plot separate control limits for each sample (Use sep. limits), or to plot the standardized (normalized) deviations of the sample means from the target specification (Normalize chart). The average n procedure is satisfactory, as long as the sample sizes do not vary by more than 10%; otherwise, choose one of the two other settings.
Open Specs
Click this button to display an Open file dialog box, which is used to retrieve previously saved specifications (*.ini file) for the current variable (chart).  
Save Specs
Click this button to display the Select specifications to be saved dialog box. Click OK in this dialog box to display a Save as file dialog box, which is used to save your specifications as an *.ini file.

Moving average line. You can include a moving average line in the charts by selecting On. If you do not want to include a moving average line in the charts, select Off.

Runs Tests
Click this button to display the Run Tests for Control Chart dialog box, which is used to select which test to perform. These tests are designed to detect patterns that may indicate that the process is out of control.