Example: Causes of Failure

During the manufacture of an MOS capacitor, different cleaning processes were used by two manufacturing systems operating in parallel. Process A used a standard cleaning solution, and Process B used a different cleaning mixture that contained less particulate matter. The failure causes that were observed with each process for five consecutive days were recorded. Now you want to compare the causes of the failure for each process.

To create this example:

In SAS Studio, click and select New SAS Program.

Copy and paste this code onto the Program tab.

data failure;
   length Cause $ 16;
   label Cause='Cause of Failure';
   input Cause & $;
   datalines;
Corrosion
Oxide Defect
Contamination
Oxide Defect
Oxide Defect
Miscellaneous
Oxide Defect
Contamination
Metallization
Oxide Defect
Contamination
Contamination
Oxide Defect
Contamination
Contamination
Contamination
Corrosion
Silicon Defect
Miscellaneous
Contamination
Contamination
Contamination
Miscellaneous
Contamination
Contamination
Doping
Oxide Defect
Oxide Defect
Metallization
Contamination
Contamination
run;

Click

to create the Work.Failure data set.

In the Tasks section, expand the Statistical Process Control folder, and then double-click Pareto Analysis. The user interface for the Control Charts task opens.
On the Data tab, select the WORK.FAILURE data set.

Tip
If the data set is not available from the drop-down list, click . In the Choose a Table window, expand the library that contains the data set that you want to use. Select the data set for the example and click OK. The selected data set should now appear in the drop-down list.
To the Process variable role, assign the Cause variable.
To run the task, click .

Here are the results: