From the course: Excel: Statistical Process Control
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When to use an X-bar R chart - Microsoft Excel Tutorial
From the course: Excel: Statistical Process Control
When to use an X-bar R chart
- [Instructor] So far in this course we have looked at discrete data, such as counts of defective units in a batch, or defects on computer monitors. In this movie, we'll look at variable data, which includes the use of the X-bar R chart. The X-bar chart and R chart are technically separate things, but you'll always see them together. We have been looking at discrete data on P and C charts. Those looked at the number of defective units or proportion, those were the P charts, and then we also had the number of defects in a given sample, that was the C chart or count chart. X-bar R charts work with continuous data. So, for example you might look at the thickness of a material that has been layered onto another surface, or perhaps temperature. I would like to make a bit of a clarification. Both the X-bar and R values are averages of averages, and if you use bar as refer to an average, then you technically would have an X-bar bar chart and an R-bar chart. However, it's a bit much to ask to…
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