I have reattached your workbook. By using the window_max and window_min functions, the desired value can be achieved. Then, changing how the calculations are computed (by Date Name) will give the desired value. On the graph, it should be computed by cell.
**Note: Date Name will need to be on the level of detail shelf
***Two separate calculations will need to be created, one for Min and one for Max.
Hope this helps!
Tableau Min.Max issue.twbx.zip 54.9 KB