Results - R/S-specs Tab

Select the R/S-specs tab of the Results dialog box to access the options described here.

Specifications for R/S-chart.

Set << >>

If you have more than one set, these buttons will be available to select which set to work with.

Center

Click this button to display the Chart center line dialog box, which is used 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 Upper Control Limit dialog box or the Lower Control Limit dialog box, respectively. Use these options 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.

If uneq. n.

Use the If unequal n 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. Note that this option is not available for all types of charts.

Open specs

Click this button to display a standard 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 the OK button in this dialog box to display a Save as file dialog box, which is used to save your specifications as an *.ini file.

Process capability

Click this button to display the Specifications for Capability Analysis dialog box, which is used to select the values the capability analyses are based on.

Runs tests

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