Options Page (Weibull Module Only)
In the Best Fit Distribution window, the Options page provides settings for specifying how to handle certain situations during the analysis of a Weibull data set. When an ALT data set is selected, this page is not shown. The following table describes the settings on the Options page.
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Option
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Description
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Omit Weibull distribution if β is greater than X
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Indicates whether to exclude the Weibull distribution if β, the slope parameter, is greater than some specified value. The default value is 15. When this checkbox is selected (default), the field to the right is available so that you can specify the largest acceptable β value. If the β value for the Weibull distribution is greater than this value, it is excluded from the analysis. When this checkbox is cleared, the Weibull distribution is not excluded due to a large β value.
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Omit Weibull (3 Parameters) if γ is less than X % of minimum time
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Indicates whether to exclude the Weibull (3 Parameters) distribution if γ, the threshold parameter, is less than some specified percent of minimum time. The default is 1 percent. When this checkbox is selected (default), the field to the right is available so that you can specify the percentage value. If the γ value for the Weibull (3 Parameters) distribution is less than this value, it is excluded from the analysis. When this checkbox is cleared, the Weibull (3 Parameters) distribution is not excluded due to a small γ value. For more information, see Threshold Parameter.
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Omit any distribution where the γ is less than 0
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Indicates whether to exclude any distribution with a negative γ value from the analysis. When this checkbox is cleared (default), a distribution with a negative γ value is not excluded. When this checkbox is selected, any distribution with a negative γ value is excluded.
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Ranking criteria
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Indicates the method to use for ranking criteria. Choices vary based on the estimation method chosen in the Weibull Advanced Parameters pane.
• For Ranked Regression, choices are Modified Correlation Coefficient, and Correlation Coefficient. The default is Modified Correlation Coefficient.
• For MLE, the only choice is Log Likelihood.
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