Gage run chart

A Measurement System Analysis (MSA) method which plots all of your observations by operator and part number to help you quickly assess differences in measurements between different operators and parts. This is one of the most helpful charts to display variability in measurements.

For example, you have three operators measuring 10 parts, three times each:

A horizontal reference line is drawn at the mean, which can be calculated from the data, or a value you enter from prior knowledge of the process. Differences in measurements between different operators and parts become evident. For example, you can see that:

·    The operators tend to measure their three replicates relatively consistently. Within each part, each of the three points for each operator are fairly similar.

·    Part 9 measurements are much higher than the mean, and Part 10 measurements are much lower than the mean.

·    On average, Operator C tends to measure slightly lower than the other operators.