Predictive and Specialized Modeling • Process Screening • Launch the Process Screening Platform • Limits Table
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Limits Table
A Limits Table contains a row for each process defined by the Process Variables and Grouping variables in your table of process data. When you use a Limits Table, the Limits Specifications window enables you to specify variables with the roles listed below. You need not specify variables for all of these roles. All of these roles are optional.
Limits Specifications Window
Columns in the Limits Table that have appropriate names or names that match the role buttons are auto-filled. For example, any column called “Process”, “Column”, or “Parameter” is auto-filled into the Process Variables list.
If you have control limits but do not have columns for Center or Sigma, then you can construct Center and Sigma columns in the Limits Table using formulas. For example:
Center = (UCL + LCL)/2
Sigma = d*(UCL - LCL)/6
where d is the square root of the subgroup size.
Process Variables
A column that contains values corresponding to the column names in your table of process data.
Grouping
One or more columns that contain the values of the grouping variables for your table of process data.
Center
A column containing values for the center line for each process. This is usually the historical process mean.
Sigma
A column containing values for the within standard deviation for each process. This is usually the historical standard deviation.
LSL
A column containing lower specification limits for each process.
USL
A column containing upper specification limits for each process.
Target
A column containing a target value for each process.

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Help created on 9/19/2017