topic X-axis of control chart builder in Discussions

X-axis of control chart builder

frankderuyck — Fri, 09 Jun 2023 00:30:11 GMT

I want to create a control chart of a concentration versus time. This works well when I don't fill in the X-axis however when moving a time variable in h:min:sec to the X area the chart changes dramatically, why is this? How to solve? Thanks

Re: X-axis of control chart builder

txnelson — Tue, 09 Mar 2021 17:50:32 GMT

It sees that the time is based upon seconds, and it will change the increment. Try changing the date time variable to nominal or ordinal, and see if that solves your issue.

Re: X-axis of control chart builder

frankderuyck — Wed, 10 Mar 2021 09:55:04 GMT

I tried to change to ordinal, nominal.. does not work.

Below a fragment of my data set, I would like the Time of day on X-axis.

For "Time of Day" column info is as follows: switching to continous or nominal does not work

Below is the result I get, what is wrong?

Re: X-axis of control chart builder

frankderuyck — Wed, 10 Mar 2021 10:07:53 GMT

This is the required IMR chart with day as phase but with X-axis "Time of day" instead of subgroup

Re: X-axis of control chart builder

tonya_mauldin — Wed, 10 Mar 2021 12:11:22 GMT

The problem is that the subgroup values are not unique. JMP finds at least one subgroup that has more than 1 observation. JMP therefore switches to an XBar chart. Control Chart Builder has no way to switch from an XBar chart to an XMR chart. The legacy control charts have this functionality. You should switch to Analyze->Quality and Process->Legacy Control Charts->IR.

Re: X-axis of control chart builder

frankderuyck — Wed, 10 Mar 2021 12:36:53 GMT

Hello Tonya, for each of the five days there is an unique process mesurement at each Time of day going from 8:00 in the morning to midnight, so when using day as phase I woud expect an ImR chart?

Re: X-axis of control chart builder

frankderuyck — Wed, 10 Mar 2021 12:39:44 GMT

Small correction above, there are 4 days (day = ordinal) labeled 2 to 5.

Re: X-axis of control chart builder

frankderuyck — Wed, 10 Mar 2021 12:53:10 GMT

Problem is solved, there was one time of day too much for 5th day and so yes no unique figure for that moment, x-axis setup is of critical imortance, thanks everyone!