topic Re: Displacement of error bars on a multi-line chart in Discussions

Displacement of error bars on a multi-line chart

Kaik — Thu, 14 Nov 2024 11:31:15 GMT

Hello,

I have a problem that I'm having a little trouble solving, let's see if someone can help me. I am trying to make line graph run in Graph Builder like this:

So far so good, a line chart whose statistic is the mean. The problem comes when I try to add the error bars, which causes the points to move out of the corresponding x-axis category. This causes confusion and a bad visualization of the data. Attached is the example:

Is there any way to solve this problem?
Thanks in advance!

Quique

Re: Displacement of error bars on a multi-line chart

MRB3855 — Thu, 14 Nov 2024 12:10:37 GMT

Hi @Kaik : Looks like a jittering issue. Set Jitter to none.

Re: Displacement of error bars on a multi-line chart

Kaik — Thu, 14 Nov 2024 12:14:06 GMT

Hi MRB,

Thanks for answering. It doesn't appear the option jitter when I choose line graph, instead of point graph!

Re: Displacement of error bars on a multi-line chart

txnelson — Thu, 14 Nov 2024 12:46:43 GMT

@MRB3855 response above is the correct answer. My response below is an Old School solution. But once again, I learn something new about JMP every day.

What you are seeing is because the X axis is either nominal or ordinal. In your example it appears to be a Character column, which is nominal. If you recode the values to numeric, continuous, and then use the Value Labels column property to map the numeric values back to the 1/2 gemmes, Control, Defoliacio labels, the offsets will be eliminated.

Here is an example using the sample Big Class data table where by default the Age variable is numeric, ordinal. When plotted in a similar layout as your chart, it has the same issue with the offsets.

In the below graph, I changed the age column to be continuous, and added Value Labels to convert the numeric values to be displayed as character labels and the offsets are eliminated.

Re: Displacement of error bars on a multi-line chart

MRB3855 — Thu, 14 Nov 2024 12:41:02 GMT

Hi @Kaik : Hmmm, how about this? Go to red triangle next to "Graph Builder" and choose "Error Bar Offset...".

Re: Displacement of error bars on a multi-line chart

Kaik — Mon, 25 Nov 2024 10:30:45 GMT

Thank you for the solution!!

Quique

Re: Displacement of error bars on a multi-line chart

Kaik — Mon, 25 Nov 2024 10:31:37 GMT

Thank you for your time Nelson!!

Quique