Launch Window Options | JMP 13.2

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Predictive and Specialized Modeling • Process Screening • Launch the Process Screening Platform • Launch Window Options

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Launch Window Options

Control Chart Type

Select one of three control chart types: Indiv and MR (Individual Measurement and Moving Range), XBar and R, or XBar and S. For more information about statistical details, see Statistical Details in the Quality and Process Methods book.

Subgroup Sample Size

Specify a constant sample size for subgroups. The minimum subgroup size is 2. A subgroup size of 5 is the default. The Subgroup Sample Size specification is ignored for Indiv and MR charts or when a subgroup variable is specified.

Shift Threshold

Specify a value that controls the sensitivity of the Shift Graph. Shift Threshold is set to three by default. After outlier removal, the Shift Graph shows a plot of the time occurrence of all process shifts that exceed the number of within-sigma units specified by the Shift Threshold. See Shift Graph.

Outlier Threshold

Specify a value that controls the sensitivity of outlier removal for detection of large recent shifts and for the Shift Graph. Outlier Threshold is set to five by default. If the number of within sigma units from an observation to both of its neighboring observations exceeds the specified Outlier Threshold, that observation is replaced with a value that is one within-sigma unit away from its closest neighboring observation. See Shift Magnitudes and Positions.

Enables you to change the exponentially-weighted moving average (EWMA) weight used in the Shift Graph. See Shift Magnitudes and Positions.

Use Limits Table

Enables you to import historical control limits and specification limits from a data table. When you select this option and click OK in the launch window, a Limits Specification window appears. Assign columns in your limits table to appropriate roles and click OK. For details. See Limits Table.

Use Medians instead of Means

Estimates the center line using the median of the observations. Sigma is estimated using scaling factors obtained using Monte Carlo simulation. The table of factors is given in Statistical Details. The calculation depends on the type of chart selected:

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For XBar and R chart or Indiv and MR chart calculations, sigma is estimated using the scaled median of the ranges.

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For XBar and S chart calculations, sigma is estimated using the scaled median of the standard deviations.

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For unequal subgroup sizes, the scaling factor corresponds to the average subgroup size rounded to the nearest integer.

When one or more outliers influence the location of the center line, many subgroups can appear out of control. Using the median alleviates this problem.

Note: When Use Medians instead of Means is selected, the results obtained from the Control Charts for Selected Items red triangle menu option will not match the Process Screening results. The Control Chart Builder has no method of using the median instead of the mean.

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Help created on 9/19/2017