Suppose you were collecting your data in real time, and you are at Day 6. Click “Add” then “Ok”.Ī blue reference line will now be added on the X axis, labeled as “Intervention”, as follows:įreezing Control Limits in a Control Chart Click on the black square next to Color and pick a different color, such as blue. Under “Reference Lines”, type “8” in “Value” and type “Intervention” in “Label”. Double-click on the X axis to open the “X Axis Specification” menu. Suppose you want to add a reference line on the X-axis that indicates the start of the intervention, on Day 7. To color the zones, click on the same red triangle as before and choose “Shade Zones”: If you want to add the control zones, click on the little red triangle next to “XBar of turnaround time”Ĭlick on “Show Zones” to show zones A, B, and C around the centerline, as follows: The X axis represents day the Y axis represents the AVERAGE turnaround time for each day. The average, upper, and lower control limits are shown on the XBar chart. You will get an XBar Control Chart and a Range Chart, as follows: Put “Day” in the “Sample Label” and “Turnaround Time” in the “Process”, as shown in the following picture. To make an XBar Control Chart using all the data available in JMP, go to Analyze>Quality and Process>Control chart>XBAR. On Day 7 (observation number 19), an intervention takes place to reduce turnaround time. There are several measurements of turnaround time within a single day therefore, you can make an XBar Control Chart. Example: You have a dataset with the variables Day, Turnaround Time, and Phase.
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