## Characterizing a measuring device

Gage R&R allows you to confirm a measuring process by verifying the device’s repeatability and reproducibility, as well as its precision.

With the R&R module, you can:

**verify the repeatability and reproducibility of a measurement,****verify the repeatability and reproducibility of a sensory evaluation (ex. visual defects),****verify a measurement’s accuracy compared to a reference.**

*We don’t know what we don’t measure*

## Gage R&R, continuous data

Several Gage R&Rs can be run during the same ELLISTAT session.

To run a Gage R&R evaluation, all you need to do is enter the number of parts, operators and repetitions to calculate the chart’s dimensions. The calculations will be made as soon as the chart is filled in. It’s possible to change the number of parts, operators and repetitions after having input the values.

ELLISTAT takes care of everything, if you put the cursor on a number, a brief reminder of the number’s significance will appear.

## Essentially visual

The graphs give visual information on the calculation’s results, making it extremely easy to understand a measurement system’s dysfunctions.

The first graph the repetition of measurements made for each part and each operator.

The second line on the graph gives the mean value of the measurements by part and by operator, as well as the range chart. A dot outside the limits of the range chart most likely signifies an outlier.

## Attribute Gage R&R

When a measurement only gives you a quantitative result, ELLISTAT lets you run an R&R evaluation of the attributes. You can do so by clicking on the cells:

Left click: OK

Right click: KO

The first result ling gives a global capability analysis and each operator is then examined.

This gives:

- Repeatability: Ability of an operator to be consistent with himself.
- Consistency: Proportion of measurements consistent with the reference measurement. Beware, a 50% consistency corresponds with a random selection of data. You should be trying for 90% consistency.
- Reproducibility: Once an operator is consistent with himself, his ability to be consistent with the reference.

## Accuracy

With the accuracy menu, you can verify the accuracy of a measurement process compared to a measured value on a reference process (assumed to be “true”).

## Take it one step further – Learn Ellistat with these video tutorials

Performing and analyzing a Gage R&R