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Control Chart Types - How Many Are There?

How Do I Choose the Right Chart?

What's the Difference Between Variable and Attribute Control Charts?

If you are struggling with any of these questions, you are not alone.

You can take classes, read articles or find a good decision tree, but next week,
you won't remember what you learned...

That is why we built control chart selection rules right into our QI Macros code.

which control chart should I choose?

QI Macros Knows the Rules and Will Choose the Right Chart For You

Shewhart Variable Control Charts

Use for Measured Data

(time, money, length, width, depth, weight, etc.)
Often contains decimals (.006, 8.9, 74.05)

Individuals Moving Range | XmR Chart: subgroup size = 1 XbarR Chart: subgroup size 2 to 9 XbarS Chart: subgroup size > 6

Shewhart Attribute Control Charts

Use for Counted Data

(number of defects, mistakes, errors, etc.)
Always a whole number (1, 44, 75)

c chart: count of defects u chart: count of defects - varying sample size p chart: fraction defective - varying sample size np chart: fraction defective - constant sample size

...It is so simple to use and anybody can use it...

...It's like a magic program. You input the data, you click the button and, "poof," there it is!
It's all done for you. It's great, I love it...

- National Association of Healthcare Quality Conference