I need to calculate the average difference between two dates but at a group level different than the base
Like the image above, if I calculate straight the average from the difference it gives me difference for all lines (7.93).
I want to calculate the difference grouping by ID and display the value as a KPI(9.83).
I believe I need a combination of average over and max and maybe a calculated field at the dataset but all my tries cames as errors or wrong results.
Any insight is helpful