Boxplot for Perform Operator Bias Study

Use Boxplot to visualize the median and range of measurements by operator and to identify unusual observations and bias when subsampling is not possible.

A positive bias means the gage or operator overestimates. A negative bias means the gage or operator underestimates.

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

Example

In this worksheet, Part contains the part number identifiers, Operator contains the operator identifiers, and Measurement contains the measurements of each part.

C1	C2-T	C3
`Part`	`Operator`	`Measurement`
1	A	5.8
2	A	5.3
3	A	5.7
4	A	5.1
5	A	5.8
6	B	5.6
7	B	5.1
8	B	5.2
9	B	5.0
10	B	5.8

How-to

Choose Solutions Modules > Capabilities > Measurement System Analysis, then select Launch.
Under Destructive Gage R&R Study, select Select a Destructive Gage R&R Study.
Select Perform operator bias study, then click OK.
Select Boxplot, then click OK.
In Graph variables (desktop app) or Y-variable (web app), enter the column that contains the measurement data.
In Categorical variables (1-4), enter the columns that define the groups.
Click OK.

Tip

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