ALT Data Points Pane for an ALT Data Set
When an ALT data set is selected in the LDA Navigator, you supply the data to analyze in its ALT Data Points pane. The table columns shown in this pane depend on selections made in the ALT Parameters pane.
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In both this module and the Weibull module, you can change, reset, and save data point column names. In the above figure, the first stress column (Stress 1) is renamed Temperature. For more information, see Renaming Data Point Columns.
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The following table describes the columns that are shown for each data type given selections for Suspensions and Groups. Failure times must be greater than 0. Suspension times must be greater than or equal to 0. While at least one stress column is always present, the number of stress columns depends on selections made in the Stress Model window. For more information, see Stress Model Window.
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Data Type
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Status of Suspensions checkbox
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Status of Grouped checkbox
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Columns
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Exact Times
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Cleared
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Cleared
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• Time of Failure. The time at which the failure occurred.
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Selected
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Cleared
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• Time to Failure/Suspension. The time at which the failure or suspension occurred.
• Failure/Suspension. Indicates whether the data point is a failure or suspension.
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Cleared
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Selected
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• Time of Failure. The time at which the failure occurred.
• Number Failed. The number of units that have failed at this period of time.
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Selected
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Selected
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• Time to Failure/Suspension. The time at which the failure or suspension occurred.
• Number in State. The number of units in the failed or suspended state, depending on the selection made in the Failure/Suspension column.
• Failure/Suspension. Indicates whether the data point is a failure or suspension.
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Interval
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Cleared
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Cleared
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• Last Inspected. The time that the last inspection was performed.
• State End time. The time at which the next inspection was performed. The value must be greater than the last inspected value.
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Selected
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Cleared
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• Last Inspected. The time that the last inspection was performed.
• Time to Failure/Suspension. The time at which the failure or suspension occurred. The value must be greater than the last inspected value.
• Failure/Suspension. Indicates whether the data point is a failure or suspension.
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Cleared
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Selected
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• Last Inspected. The time that the last inspection was performed.
• State End Time. The time at which the next inspection was performed. The value must be greater than the last inspected value.
• Number Failed. The number of units that have failed between inspections.
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Selected
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Selected
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• Last Inspected. The time that the last inspection was performed.
• Time to Failure/Suspension. The time at which the failure or suspension occurred. The value must be greater than the last inspected value.
• Number in State. The number of units in the failed or suspended state, depending on the selection made in the Failure/Suspension column. The value must be greater than or equal to 0.
• Failure/Suspension. Indicates whether the data point is a failure or suspension.
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You can enter data directly in this table or copy it from an electronic file in CSV (comma separated value) format and then paste it into the table. You can also import data into an ALT data set. For more information, see Importing Data into an ALT Data Set.
Additionally, just as in the Weibull module, you can select > to generate data points. For more information, see Generate Random Data Points Window for an ALT Data Set.