Warranty Data Analysis Example: Difference between revisions
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{{Reference Example}} | {{Reference Example}} | ||
This example | This example validates the results of a warranty data analysis in a Weibull++ warranty folio. | ||
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{{Reference_Example_Heading3}} | {{Reference_Example_Heading3}} | ||
The book first converted the data in the table above into the following format, as given in Table 11.4 in the book. | |||
{| {{table}} | |||
!TTF (Months) | |||
!Number of Failures | |||
!Number of Censored Units | |||
|- | |||
| 1||9||568 | |||
|- | |||
| 2||12||637 | |||
|- | |||
| 3||16||821 | |||
|- | |||
| 4||18||1229 | |||
|- | |||
| 5||19||1861 | |||
|- | |||
| 6||17||2032 | |||
|- | |||
| 7||21||2768 | |||
|- | |||
| 8||19||2927 | |||
|- | |||
| 9||14||3029 | |||
|- | |||
| 10||14||2203 | |||
|- | |||
| 11||6||1834 | |||
|- | |||
| 12||3||2090 | |||
|- | |||
|} | |||
A lognormal distribution is used and the fitted model parameters are: Ln-Mean = 6.03 and Ln-Std = 1.63. | |||
{{Reference_Example_Heading4}} | {{Reference_Example_Heading4}} | ||
In Weibull++, the data set is entered into a warranty folio, using the Nevada chart format. The following pictures show the sales and returns data. | |||
[[File: warranty_sales.png|center|550px]] | |||
[[Image: warranty_returns.png|center|550px]] | |||
The following picture shows the parameters of the lognormal distribution and its associated failure/suspension data. The results are the same as the results shown in the book. | |||
[[Image: warranty_results.png|center]] | |||
The following picture shows the probability plot of the lognormal distribution. | |||
[[Image: warranty_plot.png|center|550 px]] |
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