Predictive and Specialized Modeling > Process Screening > Process Screening Platform Options
Publication date: 08/13/2020

Process Screening Platform Options

The Process Screening red triangle menu contains options to customize the display and to save calculated statistics. The options that operate on selected items are also accessible by right-clicking the Column column in the Summary table.

Summary

Shows or hides the Summary table. See The Process Screening Report.

Find and Select

Enter search strings for columns that you entered as Process Variables or Grouping in the launch window. A panel appears for each column. The corresponding processes are selected in the Summary table.

Select Where

Opens the Select Where window. You can select specific processes in the Summary table that correspond to a particular condition by using the Comparison menu and Value text box. For example, you can select all processes such that Ppk < 1.33. After you click OK, the processes are selected in the Summary table.

Tip: You can also access the Select Where window by right-clicking anywhere in the Summary table.

Show Summary Columns

Enables you to choose some of the summary columns that are shown in the Summary table.

Quick Graph for Selected Items

Plots small graphs of the processes that you select in the Summary table in a Graphs of Selected Items report. The report makes it possible to view and compare many processes at once. The plots are ordered according to their order of entry on the launch window. Each quick graph also has lines for the spec limits. There is a solid blue line for the target value and dotted blue lines for the LSL and USL values. To remove the quick graphs, click the Graphs of Selected Items red triangle and select Remove.

Tip: To change the layout of the quick graphs, click the Graphs of Selected Items red triangle and select Number of Plots Across.

Control Charts for Selected Items

Opens a Control Chart Builder report window for the processes that you selected in the Summary table. The control chart corresponds to your selections in the Process Screening launch window.

Process Capability for Selected Items

Opens a Process Capability report window showing Individual Detail Reports for the processes that you select in the Summary table. If you select a process for which specification limits are not specified, a Spec Limits window appears. In this window, you can specify specification limits by selecting a data table or entering values directly.

The Process Capability analysis assumes normal distributions and uses within sigma values that correspond to your Control Chart Type selection in the Process Screening launch window:

Moving range for Indiv and MR

Average of ranges for XBar and R

Average of unbiased standard deviations for XBar and S

Note: If you specify sigma using a sigma control limit or the Derived Sigma option in the Limits Specifications window, this value is not used in Process Capability. This is because the Process Screening and Process Capability platforms use these control limits differently.

Color Selected Items

Applies a color of your choosing to the values in the selected rows of the Summary table.

Remove Selected Items

Removes the rows selected in the Summary table and reruns the analysis without those processes.

Show Tests

Shows or hides test results for Nelson tests that are selected under the Choose Tests option in the Process Screening report’s summary table.

Choose Tests

Enables you to choose the tests that you want to include in the calculation of Alarm Rate and Any Alarm.

Tip: To select multiple tests, press Alt and click the Process Screening red triangle to open a menu of all platform options.

Shift Detection

Provides options for detecting shifts after outlier removal. See Shift Magnitudes and Positions.

Largest Upshift

Adds columns for Largest Upshift and Upshift Position to the Summary table. The largest upward shift in the series that exceeds one within-sigma unit is identified. See Shift Magnitudes and Positions.

Largest Downshift

Adds columns for Largest Downshift and Downshift Position to the Summary table. The largest downward shift in the series that exceeds one within-sigma unit is identified. See Shift Magnitudes and Positions.

Shift Graph

(Available only when some processes have shifts that exceed the Shift Threshold.) Shows a plot of the time occurrence of all process shifts that exceed the number of within-sigma units specified by the Shift Threshold (three by default). You can also change the Shift Threshold by using the slider bar on the Shift Graph. Position your pointer over the diamond to see the value. Green markers indicate upshifts and red markers indicate downshifts. The markers are located at the local peaks of the shifts.

To identify the processes that correspond to one or more shift occurrences, select the points and click Select Process. The corresponding processes are selected in the Summary table. Processes that have no shifts exceeding the Shift Threshold number of within-sigma units are not plotted.

Note: The Shift Graph does not show the positions of Largest Upshift and Largest Downshift values that appear in the Summary table if the shifts are less than the specified Shift Threshold number of within-sigma units in magnitude. See Additional Example of Process Screening.

Show Shifts in Quick Graphs

(Available only when a Quick Graph has been added to the report window.) Shows the location of the shifts in the Quick Graphs using green and red vertical lines.

Drift Summaries

Adds columns for Mean Up Drift, Mean Down Drift, and Mean Abs Drift to the Summary Table.

Drift Graph Selected

Displays a drift graph for each process that you select in the Summary Table. Drift graphs enable you to detect smaller, more gradual changes in the selected processes. The values plotted are the slope estimates from a Holt Double-Exponential Smoother.

Process Performance Graph

(Available only when specification limits are defined for at least one process variable.) Shows a four-quadrant graph that assesses the performance of processes in terms of stability and capability. See Process Performance Graph.

Process Performance Graph Boundaries

(Available only once the Process Performance Graph is in the report window.) Opens a window where you can set values for the Process Performance Graph’s stability index and Ppk capability boundaries.

Tip: You can set preferences for your desired boundaries for Stability Index and Ppk Capability in File > Preferences > Platforms > Process Screening.

Goal Plot

(Available only when specification limits are defined for at least one process variable.) The Goal Plot shows, for each variable, the spec-normalized mean shift on the X axis, and the spec-normalized standard deviation on the Y axis. If you define importance values for the processes, the goal plot points are sized by importance. It is useful for getting a quick, summary view of how the variables are conforming to specification limits. See Goal Plot in Quality and Process Methods for more information about goal plots and their features.

Tip: Place your cursor over a point in the Goal Plot to view the Quick Graph for that process. Click the Quick Graph to add it to the report window.

The Goal Plot red triangle menu contains the following options:

Show Within Sigma Points

Shows or hides the points calculated using the within sigma estimate.

Show Within or Between-and-Within Sigma Points

(Available only when three way control chart is selected in the launch window.) Shows or hides the points calculated using the between-and-within sigma estimate.

Show Overall Sigma Points

Shows or hides the points calculated using the overall sigma estimate.

Shade Levels

Shows or hides the Ppk level shading. This is turned on by default. The shaded areas are described as follows, with p representing the value shown in the box beneath Ppk. By default, p = 1.33.

Points in the red area have Ppk < p.

Points in the yellow area have p < Ppk < 2p.

Points in the green area have 2p < Ppk.

Label Within Sigma Points

Shows or hides labels for points calculated using the within sigma estimate.

Label Within or Between-and-Within Sigma Points

(Available only when a three way control chart is selected in the launch window.) Shows or hides labels for points calculated using the between-and-within sigma estimate.

Label Overall Sigma Points

Shows or hides labels for points calculated using the overall sigma estimate.

Defect Rate Contour

Shows or hides a contour representing a specified defect rate.

Show Capability

(Available only when specification limits are defined for at least one process variable.) Displays a submenu that enables you to show or hide the Capabilities in the Summary table.

Note: Spec Centered Mean and Spec Scaled Std Dev are displayed in the Summary table as (Mean-Tgt)/SpecRange and StdDev/SpecRange. The Spec Limits option displays the LSL, USL, and Target columns in the Summary table.

Save Summary Table

Saves all of the information that can appear in the Summary table to a Process Summary data table. The Process Summary data table also contains specification limit details, if these are specified for at least one process. As in the summary table, the columns for Stability Index, Ppk, Cpk, Cp, and Target Index are colored as green, yellow, and red to indicate adequate, marginal, and poor stability or capability, respectively.

Save Summary Table with Graphs

Creates the Process Summary data table with an additional column titled Graph. The Graph column contains a quick graph for each process in the Process Summary table.

Save Details Table

Saves detailed information about control chart calculations to a Process Details data table. For each combination of process and grouping variables, the table contains a row for each subgroup showing:

The values of the subgroup sample statistics.

The control limits.

The subgroup size.

A list of indicators for which, if any, alarms were triggered. Alarms for the Nelson tests are indicated with the numbers for the tests. An alarm for the Range Limit Exceeded test is indicated with an R.

The Drift

Save Selected Details

For the selected rows in the Summary table, saves a Process Details table with the information that is saved when you select Save Details Table.

See Local Data Filter, Redo Menus, and Save Script Menus in Using JMP for more information about the following options:

Local Data Filter

Shows or hides the local data filter that enables you to filter the data used in a specific report.

Redo

Contains options that enable you to repeat or relaunch the analysis. In platforms that support the feature, the Automatic Recalc option immediately reflects the changes that you make to the data table in the corresponding report window.

Save Script

Contains options that enable you to save a script that reproduces the report to several destinations.

Save By-Group Script

Contains options that enable you to save a script that reproduces the platform report for all levels of a By variable to several destinations. Available only when a By variable is specified in the launch window.

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