To modify the default probability plot
main topics      

1    In the main dialog box, click Graphs.

2    Do any of the following:

To...

Do...

Specify the method used to obtain the plot points

See Tools > Options > Individual Graphs > Probability Plots to choose Median Rank (Benard), Mean Rank (Herd-Johnson), modified Kaplan-Meier (Hazen), or Kaplan-Meier method.

Choose what to plot when you have tied failure times

For Parametric Distribution Analysis (Right Censoring)

Under Handle tied failure times by plotting, choose All points (default), Maximum of the tied points, or Average (median) of tied points.

Turn off the 95.0% confidence interval

Uncheck Display confidence intervals on above plots.

Choose how plots are displayed

Choose Overlaid on the same graph to have multiple samples plotted on the same graph, In separate panels on the same graph to have multiple samples plotted in separate panels all on the same graph, or On separate graphs to have each plot displayed separately.

Specify a minimum and/or maximum value for the x-axis scale

In Minimum X scale or Maximum X scale, enter values for the scale minimum and maximum.

Enter a label for the x-axis

In X axis label, type a label.

3    Click OK.

4    To change the confidence level for the 95.0% confidence interval to some other level, click Estimate. In Confidence level, enter a value. Click OK.

5    To change the method used to obtain the fitted line, click Estimate. In Estimation Method, choose Least Squares (default) or Maximum Likelihood. Click OK.