JMP19 not summarizing Subgroups properly in p-Chart

ValeriaJMP — Mon, 08 Jun 2026 14:10:46 GMT

Hi JMP Support Team,

I have encountered what appears to be a regression in P Chart functionality when moving from JMP 18 to JMP 19. In JMP 18, I was able to create a P Chart directly from my raw data by assigning:

Fails as the defect indicator
Eval_Week as the subgroup
Total as n Trials

JMP 18 would aggregate all observations belonging to the same week and display a single point per week on the control chart.

After upgrading to JMP 19, the same workflow no longer produces one point per subgroup. Instead, the chart displays individual observations, effectively requiring me to create a summarized table before generating the chart.

My expectation is that assigning a variable to the Subgroup role should allow JMP to aggregate observations belonging to the same subgroup value without requiring a separate summarization step. This was the behavior I relied on in JMP 18 and it is important for my workflow because I frequently need to investigate and chart data directly from the raw dataset.

Could you please clarify whether:

This is a known issue or change in JMP 19.
There is a setting that restores the JMP 18 behavior

Thank you

Re: JMP19 not summarizing Subgroups properly in p-Chart

jthi — Mon, 08 Jun 2026 14:45:00 GMT

Most likely this has been answered quite a few times in community (or something very close to it). Quite a few of issues related to control chart builder in JMP19 can be solved by enabling this

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JMP19 not summarizing Subgroups properly in p-Chart

Re: JMP19 not summarizing Subgroups properly in p-Chart