Warranty Data Analysis Example

This example compares the warranty data analysis results.

The data set is from Example 11.2 on page 453 in the book Life Cycle Reliability Engineering by Dr. Guangbin Yang, John Wiley & Sons, 2007.

A Nevada chart for the warranty data is provided in Table 11.3. The last two rows were combined, as specified in the example.

The book first converted the data in the table above into the following format, as given in Table 11.4 in the book.

A lognormal distribution is used and the fitted model parameters are: Ln-Mean = 6.03 and Ln-Std = 1.63.

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.





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.



The following picture shows the probability plot of the lognormal distribution.