Viewing Plots for Multiple Data Sets
When you select the Multiple Data Sets folder in the LDA Navigator, you can plot data sets with similar parameters and the same distribution simultaneously on the same graph. You can use this type of plot to compare any number of things, including:
• Data sets from different failure modes for the same product
• Data sets collected at different operating conditions, such as circuit board test-to-failure data at both 50 degrees C and 60 degrees C
• Data sets of similar products, such as failure data for bearings from different suppliers
• Data sets from different time frames, such as those from the past five calendar years
• Data sets collected from a system before and after a redesign
In this case, you view data sets for a hard disk before and after a redesign.
To view both hard disk data sets on one plot:
1. Select the LDA Navigator.
2. Under Analysis type, ensure Life Data is selected.
3. Under Data sets, select Multiple Data Set Plots.
4. Select > . A new data set row appears in this folder.
This new data set, which is named Multiple Data Set Plot by default, is automatically selected.
5. Enter My Weibull Multiple Data Set Plot.
6. In the Weibull Plot Options pane, click Select All to select the two revisions listed for the hard disk.
The plot in the Weibull Plot pane plots both data sets. If you select only some of data sets available in the Weibull Plot Options pane, you can always go back and select them to add them to the plot.