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Weibull++ Life Data Folio

Control Panels

Life Data Folio Analysis Settings


 ReliaWiki: Life Distributions

Weibull++ Life Data Folio Control Panel

The Weibull++ life data folio control panel allows you to configure the analysis settings for the data sheet and view/access the results. It consists of multiple pages, each containing options for performing particular tasks. This topic focuses on the Main page of the Weibull++ life data folio control panel, which contains most of the tools you will need to perform life data analysis. For more information about the control panel in general, see Control Panels.

Control Panel Main Page

Tip: If you are not certain which distribution would provide the best fit for your data, you can use the Distribution Wizard to guide you through the selection process.

The following table serves as a guide to the abbreviations. These settings are also available on the Analysis page of the control panel (see Life Data Folio Analysis Settings for a description of these settings). Note that the available options will vary depending on the data type, distribution and analysis method you have selected.

Analysis Method

Rank Method

Rank Regression on X (RRX)

Standard Ranking Method (SRM)

Rank Regression Y (RRY)

ReliaSoft Regression Method (RRM)

Non-Linear Rank Regression (NLRR)

 

Maximum Likelihood Estimation (MLE)

 

 

Confidence Bounds Method

Rank Method

Fisher Matrix Confidence Bounds (FM)

Median Ranks (MED)

Likelihood Ratio Confidence Bounds (LRB)

Kaplan-Meier Estimator (K-M)

Bayesian Confidence Bounds (BSN)

 

Beta-Binomial Confidence Bounds (BB)

 

Tip: If you use the 3-parameter Weibull distribution, you have the option to display the theta parameter, which is the sum of the values of the eta and gamma parameters. To include the theta parameter in the results, select the Show Theta check box on the Weibull++ Folios page of the Application Setup. Note that for the 1-parameter and 2-parameter Weibull distributions, the value of gamma is zero; therefore, if you select to display theta for these distributions, the value of theta will be identical to the value of eta. As an alternative, you can select to always display the theta parameter instead of eta. To do this, click the Calculations page of the Application Setup and select the Use Theta parameter scheme on Weibull check box.

Additional Results

The following tools may also be used in conjunction with your own engineering knowledge about the model in order to further evaluate the fit of the distribution to the data set.

Folio Tools

The folio tools are arranged on the left side of the Main page of the control panel. Use these tools to manage data and experiment with the results of your analysis.

  Calculate estimates the parameters of the chosen distribution, based on the current data set and the specified analysis settings. This tool is also available by choosing Life Data > Analysis > Calculate.

  Plot creates a new sheet in the folio that provides a choice of applicable plot types. For life data folios, this includes plots such as reliability vs. time, failure rate vs. time, probability plot, etc. This tool is also available by choosing Life Data > Analysis > Plot.

  QCP opens the Weibull++ Quick Calculation Pad, which allows you to calculate results based on the analyzed data sheet, such as the probability of failure, mean life, etc. This tool is also available by choosing Life Data > Analysis > Quick Calculation Pad.

  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). This tool is also available by choosing Life Data > Analysis > Distribution Wizard.

  Alter Data Type opens the Weibull++ Folio Data Sheet Setup window, which allows you to change the data entry columns in the current data sheet. Note that when you change the setup, you may lose information already entered in the data sheet. For example, switching the data sheet from one that supports interval data to one that supports only right censored data will remove all the inspection times. This tool is also available by choosing Life Data > Format and View > Alter Data Type.

  Change Units opens the Change Units window, which allows you to change the units for the values in the current data sheet.

  Auto Group Data opens the Auto Group Data window, which allows you to group together identical data points. Grouping data significantly speeds up calculations when you have a very large data set. This tool is also available by choosing Life Data > Options > Auto Group Data.

  Alter Parameters (also called Alter Parameters w/o Recalculation) allows you to manually alter the value of one (or more) parameters, while keeping the original values of the rest of the parameters and the variance/covariance matrix the same. The LK value, the solution line on plots and all subsequent analyses will be based on the modified set of parameters.

  Specify Points opens the Specify Points window, which allows you to adjust the way that the line is fitted to the points for a rank regression analysis. The ranks will be calculated based on all of the data points but the regression line will be fitted only to the points you have specified. This tool is also available by choosing Life Data > Options > Specify Points.

  Color Data Values applies different font colors to the entries in the data sheet for easy visualization. Note that whenever you edit or add new data to the data sheet, you must choose one of the Color Data Values commands again in order to apply the font colors.

  Batch Auto Run opens the Batch Auto Run window, which allows you to extract data from an existing data set based on the subset ID. This tool is also available by choosing Life Data > Options > Batch Auto Run.

 

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