Hotelling T2 for Means, and Multiple Stream Charts Results Dialogs - GV Specs/R/S Specs Tab

Select the Gv specs tab of the Hotelling T2 for Means dialog box, or select the R/S specs tab of the Multiple Stream Charts Results dialog box to access the options described here.

Element Name Description
General Options Applicable to All Charts
Open Specs Displays a standard Open file dialog box, which is used to retrieve previously saved specifications (*.ini files) for the current chart.
Save Specs Displays 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.
Set << >> If you have more than one set, these buttons are available to select which set you want to work with.
Specifications for Hotelling T2 for Means
Target Values (Estimated/User defined). When the Estimated option button is selected (the default) Statistica will estimate the target values. Select the User defined option button to display a General User Entry Spreadsheet where you can specify the covariance matrix to be used by the program.
Sigma Displays a General User Entry Spreadsheet for specifying Sigma, to specify the variance/covariance matrix for the multivariate chart. This option enables you to specify a Sigma matrix that was previously computed, e.g., when the process was known to be in-control. See also Computational Details for additional information.
UCL You can specify the upper control limit for the Generalized Variance (GV) multivariate chart (for the variance/covariance matrices across samples). The upper control limit is specified in terms of a probability (p).
LCL You can specify the lower control limit for the Generalized Variance (GV) multivariate chart (for the variance/covariance matrices across samples). The lower control limit is specified in terms of a probability (p).
Warning lines You can specify the lower and upper warning lines for the Generalized Variance (GV) multivariate chart. These are specified using the same "units" as the UCL/LCL values (i.e., as probabilities p), and are typically set to identify out-of-warning-limits samples with a probability lower than the UCL (and hence, with a greater false-alarm rate).
Specifications for Multi-Stream Charts
Center Displays 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 Displays the Upper Control Limit dialog box or the Lower Control Limit dialog box, respectively. Use these dialog boxes 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 Displays 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.