To make a distribution overview plot (uncensored/right-censored)
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1    Choose Stat > Reliability/Survival > Distribution Analysis (Right Censoring) > Distribution Overview Plot.

2    In Variables, enter the columns of failure times. You can enter up to 50 columns (50 different samples).

3    If you have frequency columns, enter the columns in Frequency columns.

4    If all of the samples are stacked in one column, check By variable, and enter a column of grouping indicators in the box.

5    Choose to draw a parametric or nonparametric plot:

·    Parametric plot - Choose Parametric analysis. From Distribution, choose to plot one of the eleven available distributions.

·    Nonparametric plot - Choose Nonparametric analysis.

6    Click Censor.

7    Do one of the following, then click OK.

·    For data with censoring columns: Choose Use censoring columns, then enter the censoring columns in the box. The first censoring column is paired with the first data column, the second censoring column is paired with the second data column, and so on.

If you like, enter the value you use to indicate censoring in Censoring value. If you do not enter a value, Minitab uses the lowest value in the censoring column.

·    For time censored data: Choose Time censor at, then enter a failure time at which to begin censoring. For example, entering 500 says that any observation from 500 time units onward is considered censored.

·    For failure censored data: Choose Failure censor at, then enter a number of failures at which to begin censoring. For example, entering 150 says to censor all (ordered) observations from the 150th observed failure on, and leave all other observations uncensored.

8    If you like, use any of the available dialog box options, then click OK.