Select the graphs to display for Parametric Distribution Analysis

Select the graphs to display. You can also display confidence intervals, choose how to display multiple samples, and specify the x-axis scale.

Probability plot

Select to display the probability plot, and then indicate how you want Minitab to plot identical failure times.

When the data are right-censored or complete, the analysis has options for the display of tied points.

• All points: Plot the cumulative percents for each occurrence of a failure time.
• Average (median) of tied points: Plot the median cumulative percent of identical failure times.
• Maximum of tied points: Plot the maximum cumulative percent of identical failure times.

Note

To change the default method that Minitab uses to calculate points on the probability plot, choose File > Options > Individual Graphs > Probability Plots.

Display censored observations on probability plot

Include symbols for right-censored and left-censored observations on the probability plot. Left-censored observations are only possible to specify with interval-censored data.

Survival plot

Display a plot that shows the percentage of items surviving at time t.

Cumulative failure plot

Display a plot that shows the cumulative percentage of items failing at time t.

Hazard plot

Display a plot that shows the instantaneous rate of failure at time t.

Display confidence intervals on above plots

Display confidence intervals on the probability plot, survival plot, and cumulative failure plot. You can only display confidence intervals when you select Maximum Likelihood from Estimation Method on the Distribution Fitting sub-dialog box.

Display sample plots

Indicate how you want to display the graphs for multiple samples. You can overlay the graphs for each variable (or each level) on the same graph, or you can display each graph separately.

Minimum X scale

Enter a value to use for the minimum of the x-axis scale. If you do not enter a value, Minitab automatically determines the minimum value of the x-axis scale on the graphs.

Maximum X scale

Enter a value to use for the maximum of the x-axis scale. If you do not enter a value, Minitab automatically determines the maximum value of the x-axis scale on the graphs.