Gage Linearity and Bias Study

Use Gage Linearity and Bias Study to assess the accuracy of your measurement device across its operating range.

This example applies to the Measurement System Analysis Module. For more information, go to www.minitab.com/measurement-system-analysis-module.

Example

An engineer wants to assess the linearity and bias of a measurement gage that is used to measure inner diameters of bearings. The engineer chooses five bearings that represent the expected range of measurements. Each part was measured by layout inspection to determine its master measurement, and then one operator randomly measured each part 12 times. Part contains the identifiers for 5 parts. Reference contains the known reference value. Measurement contains the measurements.

C1	C2	C3
`Part`	`Reference`	`Measurement`
1	2	2.7
1	2	2.5
1	2	2.4
1	2	2.5
1	2	2.8

How-to

Choose Solutions Modules > Capabilities > Measurement System Analysis, then select Launch.
Under Bias Study, select Select a Bias Study.
Select Perform gage linearity and bias study, then click OK.
Select Gage Linearity and Bias Study, then click OK.
In Part numbers, enter the column that contains the part names or numbers.
In Reference values, enter the column that contains the reference values for each part. The reference value is the known standard measurement for each part.
In Measurement data, enter the column that contains the observed measurements.
(Optional) In Process variation, enter a value that represents 6 * the process standard deviation, if you have it. You can either enter the process standard deviation from the Total Variation row of the Study Var (6 * SD) column of the output from a gage R&R study, or you can enter a known value (6 * the historical standard deviation).
Click OK.

Tip

For more information about this analysis, click Help in the main dialog box.