Special cause variation, I love to see it! That’s because I know I’m about to learn something important about my process. A ...

The following statements create a p chart displaying both sets of control limits: title 'p Chart with Revised Limits for Failed Circuits'; symbol v=dot c=salmon; proc shewhart data=circ_one ...

When you are working with subgrouped data, it can be helpful to accompany a cusum chart for means with a Shewhart s chart for monitoring the variability of the process. This example creates this ...