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After you click OK on the launch window, the Spec Limits window appears if the data table does not contain limits for the selected columns and you did not select Ignore columns with no spec limits on the launch window. Spec Limits Window for Cities.jmp shows the Spec Limits window for the Cities.jmp sample data table after selecting OZONE, CO, SO2, and NO in the launch window. Enter the known spec limits and click Next to view the reports.
You can also retrieve a limits data table with the Import Spec Limits option from the Spec Limits red triangle menu. Select Import Spec Limits and then select the appropriate data table that contains the specification limits for the analysis. After selecting the appropriate limits table, the values populate the window. Click Next to continue to the reports window.
All limits data tables must have a column for each of the variables whose values are the known standard parameters or limits. A limits data table can be in two different formats: wide or tall. Either you have a column for each response with the limits key or you have one column for each response and the limits key words are the columns. Either of these formats can be read using the Import Spec Limits command. Wide (Top) and Tall (Bottom) Spec Limit Tables shows an example of both types of limits data tables.
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A wide table contains one column for each column analyzed in the Capability platform, with three rows plus a _LimitsKey column. In the _LimitsKey column, the three rows need to contain the identifiers _LSL, _USL, and _Target.
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The easiest way to create a limits data table is to save results computed by the Capability platform. The Save Spec Limits command in the Capability red triangle menu automatically saves limits from the sample values. After entering or loading the specification limits, you can save the limits in the following ways:
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Save the limits to the data table by selecting Save Spec Limits as Column Properties.
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Save the limits to a new wide data table, with a column for each analyzed column, by selecting Save Spec Limits in New Table.
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Save limits to a new tall data table, with a row for each analyzed column, by selecting Save Spec Limits in New Table - Tall. Consider this option for tables that have hundreds of variables.
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When you perform a capability analysis, you do not have to re-specify the limits each time. Use the Column Properties > Spec Limits property in a data table to save specification limits as a column property. Saving these limits in a column also facilitates consistency from use to use. For example, you might run an analysis that uses these limits. When you come back later and change the data, you can run a new analysis on the new data using the same limits. Spec Limits Section of the Column Properties Window displays the Spec Limits section of the Column Properties window for OZONE in the sample data table Cities.jmp.
The Show as graph reference lines option draws specification limits as reference lines on a graph. For more information about column properties, refer to Using JMP.
