JMP 19 Dates out of Order - Control Chart

johnolone1 — Fri, 16 Jan 2026 18:35:42 GMT

Hello,

I am looking to make a control chart to monitor the behavior of two materials over time. When I make the control chart through the analysis screen, for some reason when I plot any date variable on the x-axis the dates aren't in chronological order. I have saved a script to show this in the attached file. When I plot the MFG Month on the standard graph builder everything looks fine.

I just upgraded to JMP 19 yesterday, so I am thinking my settings may be out of order. I double checked the variable type and value order in column properties and everything looks normal. What makes this more confusing, is that I am able to send this data file with the saved script to coworkers with older versions of JMP, and the dates appear in order. Is there anything I can do to fix this? Or possibly something in my settings that could help fix this error?

Re: JMP 19 Dates out of Order - Control Chart

jthi — Fri, 16 Jan 2026 18:39:10 GMT

This has been discussed in community many times, for example here . You most likely will have to enable Sort by Subgroup from the red triangle menu

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JMP 19 Dates out of Order - Control Chart

Re: JMP 19 Dates out of Order - Control Chart