topic Re: Xbar Control Charts require Table to be Sorted by Subgroup? in Discussions

Xbar Control Charts require Table to be Sorted by Subgroup?

MachineIguana50 — Mon, 04 May 2026 15:34:27 GMT

Hello -

When using the Xbar Control Chart function, I've found that despite using a Column to identify the Subgroups, the data table must also be sorted by the Subgroup Column to properly chart the data. Further, despite having a Value Order Column Property on the Subgroup Column, the x-axis is still ordered by Row of the Table.

I understand showing data in Row order is appropriate to a Run Chart, however, for Xbar Control Charts, x-axis ordering should be dictated by the Subgroup.

Is there a way to override this forced-ordering? Can it be modified in future editions of JMP?

Thanks-KL

Re: Xbar Control Charts require Table to be Sorted by Subgroup?

statman — Mon, 04 May 2026 15:50:48 GMT

I'm a little confused by your query. Using control charts requires the data to be in some rational order. Most often the default order is a time series, but it is not the only possible rational order. If you want control charts by subgroups without time order, there is no need to sort anything, just choose Subgroup. If you want time order, then the table needs to be sorted in time order (top to bottom) or indicate to JMP what time order is.

Re: Xbar Control Charts require Table to be Sorted by Subgroup?

jthi — Mon, 04 May 2026 17:22:49 GMT

Which JMP version are you using? In JMP19