Hello @arnaudsteyaert ,

To use the confidence interval for the geometric mean for graphing, you need to first create a column in your data table with the formula. You can see the details of the calculation on the following page.

https://blogs.sas.com/content/iml/2019/10/02/geometric-mean-deviation-cv-sas.html

Once you have created the column, you can create a graph by following these steps.

--Select Graph --> Graph Builder

--Select Y and drag it to the left of the Y axis.

--Select Time and drag it to the bottom of the X axis.

--Select Group and drag it to the Overlay Zone

--Select Columns with Lower and Upper Confidence Interval Formula and drag them to the Interval zone.

--Select "Geometric Mean" in the "Summary Statistics" section.

Please see the attached sample data for your information. I hope it helps.