Graphically analyzes all of your observations by operator and part number. Use this chart to quickly assess differences in measurements between different operators and parts. A stable process would display a random scattering of points; an operator or part effect would display a pattern in the plot.

Answers the questions:
  • Do differences in measurements exist between operators?
  • Do differences in measurements exist between parts?
When to Use Purpose
Start of project Verify different operators can measure the same part repeatedly, with no differences between operators or within the same operator. You must verify the measurements of inputs and outputs.


Continuous Y and two X's (Part and, typically, Operator). Gage output must be continuous and sample parts must be measured by multiple operators.


  1. The gage run chart requires the same type of data that you would use for a gage R&R (crossed) study.
  2. Select parts and have multiple appraisers evaluate each of the parts multiple times.
  3. Enter the part identifier into one column, measurements into a second column, and appraiser name (or other variable) in a third column.


  • The operators can be replaced by another factor (for example, you have three different gages that are supposed to be identical, or you want to evaluate three different operating temperatures).
  • If you have discrete numeric data from which you can obtain every equally spaced value and you have measured at least 10 possible values, you can evaluate these data as if they are continuous.
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