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Warranty Tab

The Warranty tab is visible when you view a warranty folio data sheet for warranty analysis.

Analysis

  Calculate converts the warranty claims data to failure/suspension times and then estimates the parameters of the chosen life distribution based on the converted data. If you select the Use Subsets option on the Main page of the control panel, the parameters of the distribution of each subset ID will be separately calculated.

  Plot creates a new sheet in the folio that provides a choice of applicable plot types. In warranty analysis folios, this includes plots such as expected failures vs. period, reliability vs. time, probability plot, etc. You can plot the data in the warranty analysis folio either with or without generating a forecast.

  Quick Calculation Pad opens the Weibull++ Quick Calculation Pad, which allows you to calculate life data analysis metrics. It uses the same calculations that you can perform in a Weibull++ standard folio QCP.

  Distribution Wizard opens the Distribution Wizard, which helps you select the distribution that best fits your data based on the selected parameter estimation method (i.e., RRX, RRY or MLE). In warranty analysis folios, the ranking in the Distribution Wizard is based on the converted failure/suspension times.

Tools

  Forecast opens the Forecast Setup window, which allows you to specify the time periods at which you wish to estimate the number of expected warranty returns. Clicking Forecast before the parameters have been calculated will automatically calculate the parameters and open the Forecast Setup window.

  Restore Guide Colors restores the colors of the cells in the data sheet to the default guide colors. This command applies only if you have altered the cell colors of the Returns sheet in a Nevada chart format warranty folio. (The colors can be altered by select the desired cells or row/column header and then choosing Home > Edit > Format Selection > Fill Color). Guide colors are used in the Statistical Process Control feature of the Nevada chart format. The default guide colors are:

• • Green for the number of product returns that are within the expected range.

  • Yellow for the number of product returns that are between the caution and critical levels.

  • Red for the number of product returns that are above the critical range.

  Data Sheet Setup is available only for the Nevada chart format. It opens the Warranty Setup window, which allows you to change the time periods of the warranty claims data in the current data sheet.

  Convert Data converts the format of the currently active warranty analysis folio to a new format. Converting formats creates a new folio and does not overwrite the contents of the existing folio. It is an automatic process, except when converting from the Dates of Failure format to Nevada chart format. In that case, you will be prompted to define the time unit of each period (e.g., dates, month or years) in order to proceed with the conversion. The following table shows the data conversion options.

Transfer Life Data

  Transfer Life Data to New Folio allows you to transfer the failure/suspension times to a new Weibull++ standard folio in order to perform life data analysis.

  Transfer Life Data to Selected Folio allows you to transfer the failure/suspension times to an existing Weibull++ standard folio in order to perform life data analysis.