Multiple Data Set Plots for Life Data Analysis
When you select Life Data as the analysis type in the LDA Navigator, you can insert special data sets under the Multiple Data Set Plots folder. In these data sets, you do not supply data points for analysis but rather select two or more existing life data sets for which to generate plots simultaneously in the Weibull Plot pane. With results for multiple data sets shown in the same plot, you can visually compare them to determine if significant differences exist.
When a Multiple Data Set Plots data set is active in the LDA Navigator, only two other Weibull panes are shown: Weibull Plot Options and Weibull Plot. In the Weibull Plot Options pane, the Analysis option controls the type of life data sets you can plot. For example, when Life Data is selected, the Data sets area lists only parametric life data sets. In this case, you select the data sets to plot simultaneously in the Weibull Plot pane. You can click Select All or Clear All to select or clear all data sets and then customize your selections from there.
Under Data sets, you see the same options that are described in Options for Multiple Weibull Plots. The selection you make for Number of plots controls the other options that are shown.
• When Single is selected, Plot type provides for choosing the single plot to display in the Weibull Plot pane for multiple data sets.
• When Multiple is selected, additional options are made available. While these options are the same as those described in Options for Multiple Weibull Plots, they indicate how to vary multiple plots for multiple data sets. For more information, see Plotting Multiple Life Data Sets Simultaneously.
◦ When the Weibull Plot pane contains a single plot for multiple data sets, it displays the data points and lines for each data set in a different color.
◦ When the Weibull Plot pane contains multiple plots for multiple data sets, within each plot, it displays the data points and lines for each data set in a different color.
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To successfully generate multiple probability plots that vary by distribution, the data sets selected must have the same distribution or at least use the same scaling for the x-axis. For example, data sets using the Weibull, Rayleigh, and/or exponential distributions can be graphed in the same plot because these distributions all use the same x-axis scaling. For data sets using the gamma distribution, multiple probability plots cannot be generated. If situations where a multiple probability plot cannot be generated, Probability is not included in the list for plot types. Finally, if a selected data set has free form data, a contour plot cannot be generated for that data set.
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