Reliability HotWire

Reliability HotWire

Issue 119, January 2011

Tool Tips

*How can I segregate my data in Weibull++?

In Weibull++, you can use the Batch Auto Run tool to extract subsets of your data into new data sheets for separate analysis.

To use the tool, you will first need to define a subset ID for each data point you want to extract, making sure that the data points you wish to group together all have the same ID. For example, the following data sheet contains failure times for a product that was manufactured in two different plants. The Subset ID column identifies the facility that manufactured each failed unit.

Entire Data Set

If you wish the analyze the data for each plant separately, choose Data > Batch Auto Run or click the icon that appears on the Main tab of the standard folio’s control panel and on the Data Analysis toolbar.

Batch Auto Run icon

When the utility opens, you will see a list of all the subset IDs that are available to be extracted and a list of those that have already been selected. To select one or more subsets, you can a) click and drag the ID from one column to the other, b) double-click the ID or c) use the Select All Available or Clear All Selected buttons below the columns. The following picture shows the tool with both subset IDs selected for extraction into separate data sheets.

Subset Extraction

The Set Action Preferences for Processing tab provides some calculation and naming options for the new data sheet(s) that will be created. For this example, we have selected the option to automatically calculate the parameters for each new data sheet, as shown next. When you click OK to create the new data sheets, the parameters will be calculated based on the distribution that was selected in the original data sheet.

Subset Calculation Options

NOTE: There’s another feature in Weibull++ called "Specify Points" that has a similar interface but a different purpose. As seen in this example, the Batch Auto Run tool creates separate data sets so you can analyze them separately. Alternatively, the Specify Points tool allows you to mark specific points within a single data sheet as "outliers" in order to give them special treatment in a rank regression analysis. For more information about this feature, see

*What resources are available to help me learn to use ReliaSoft’s software tools?

At ReliaSoft, we understand how important it is for users to "hit the ground running" when they install a new software tool. Therefore, we strive to provide user interfaces that are as intuitive and familiar as possible, and we also provide multiple resources to help you explore and master the software’s capabilities. These include:

  • Example Files
    Most of ReliaSoft’s software tools are shipped with a variety of example files designed to help you explore specific capabilities "hands-on." These files provide sample data sets and often include documents that discuss how the software can be used for a particular analysis scenario. To access these files, choose Help > Open Examples Folder or follow the instructions provided in the software documentation.
  • Training Guides
    ReliaSoft’s software training guides provide multiple application examples with step-by-step instructions for using the software to complete the analysis. These guides are available free for download from For many products, you can also choose Help > Web Resources > Training Guide to open the print-ready document directly from the software interface. NOTE: Training guides are in *.pdf format and require the Adobe Acrobat Reader® to view or print.
  • User Documentation
    All of ReliaSoft’s software tools come with detailed user interface documentation (press F1 or choose the command from the Help menu). When applicable, the product may also include a comprehensive "textbook" that describes the specific reliability engineering methods and principles that the software facilitates.
  • Training Courses
    ReliaSoft offers an extensive curriculum of reliability training courses that provide thorough coverage of the underlying principles and theory, along with hands-on training for the applicable software tools. Visit for the latest course list and registration information.