Control Chart Types

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

One uses measured data; the other uses counts.

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Variable (e.g., measured time, weight, length, money, etc.)

Variable control charts use measurements (time, money, length, width, depth, weight, etc.).
When looking at data, variable measurements often have one or more decimal places (e.g., 74.05).

The most common type of variable control charts are X charts:

Less common types of variable control charts include:

Attribute (e.g., counted defects, mistakes, errors, etc.)

Attribute type control charts use counted data (number of defects, mistakes, errors, injuries, etc.)
When looking at your data, attribute data is always an integer (e.g., 1, 3, 5).

Common attribute type control charts include:

Other attribute control charts include:

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