Three way control charts are useful when there is variation between batches and variation within batches.
1. Select Help > Sample Data Library and open Quality Control/Vial Fill Weights.jmp.
2. Select Analyze > Quality and Process > Control Chart > Three Way Control Chart.
3. Select Fill Weight and click Y.
4. Select Sample and click Subgroup.
5. Click OK.
Figure 3.31 Three Way Control Chart for Fill WeightÂ
A Moving Range chart appears between the Range and Average charts. The limits on the Average (XBar) chart are now calculated using the moving range between each sample.